Donatello (Teenage Mutant Ninja Turtles)

Donatello, nicknamed Don or Donnie, is a fictional superhero and one of the four main characters of the Teenage Mutant Ninja Turtles comics and all related media. He is co-creator Peter Laird's favorite Turtle. In the Mirage comics, all four of the Turtles wear red masks. In the animated cartoons, he dons a purple mask. The creators gave all four turtles different mask colors, in order to tell them apart.
He is usually depicted wearing a purple eye mask. His primary signature weapon are his 2 effective bō staffs. In all media, he is the smartest of the four turtles. He is listed as in height on the original action figure release. Donnie often speaks in technobabble with a natural aptitude for science and technology. His ninja skills are the lowest of the four turtles; as he relies on gadgets over combat skills. He is the middle of the turtles, and third-in-command. Like all of the brothers, he is named after a Renaissance artist; in this case, he is named after Italian sculptor Donatello.
Comics.
Mirage Comics.
In the comics, Donatello is depicted as the calmer turtle. While the comics portrayal of the team has no official command structure, in the early stories he is depicted as second-in-command, prior to Raphael taking that position. In the first issue, he is the one that killed the Shredder by knocking him and his grenade off the roof. The second issue elaborated more on each turtles' personalities and opened with Donatello soldering a circuit. Later in the issue, Donatello states that he is "familiar with some computer systems" and helps April O'Neil deactivate the Mousers. During the turtles' exile to Northampton, Donatello becomes obsessed with fixing up and repairing the many broken things within the farmhouse they were living in. Most notably he spent days and nights fixing the boiler to give his family hot running water and builds a windmill and a water wheel to provide electricity. He also finds an old typewriter and writes his own personal credo.
In the "Donatello" one shot, Donatello encounters an artist called Kirby (an homage to the comic artist Jack Kirby) whose mysterious crystal brings his drawings to life before disappearing. The two newfound friends journey to a dimension inhabited by Kirby's creations and help the heroes defeat the invading monsters.
In the "Shades of Grey" storyline, Casey Jones encounters the turtle by a ravine as he was pondering "the fractal structure of natural patterns". Casey accuses the turtle of using big words and acting better than everyone else. Donatello suggests they should continue the conversation when Casey is sober. Grabbing a stick, an angry Jones continually pokes the turtle until he loses his temper and sends Casey careening into the water.
In the "City at War" storyline, the turtles return to New York to put an end to the Foot Clan's civil war. During a battle with Shredder's Elite Guards in the ruins of the Second Time Around Shop, Donatello falls through the floor and breaks his leg. Seeing their ally Karai subdued and about to be killed, Donatello grabs one of the Foot's machine guns and repeatedly shoots the Foot Elite. Donatello is visibly shaken by the violence and throws the gun away. At the end of the story the turtles, April and Casey move back to New York save for Donatello who chooses to stay in Northampton with Master Splinter to heal from his injury as well as reflect on everything that had happened. After encountering the turtle vigilante ally Nobody in civilian guise he returns with him to New York to help his brothers battle Baxter Stockman.
In the current comics, Donatello finds an armored truck in the sewers which apparently had been part of a bank robbery in the sixties. Along with Raphael and Casey Jones, he undertakes the task of fixing up the vehicle. Donatello decides to accompany the Utroms on a mission to Tepui to search for two missing research teams. The group are attacked by strange wooden creatures who shrink them to miniature size. The creatures turn out to be a group of Utroms which had been stranded in the Jungle during their first stay on Earth and had been living in secret thanks to their Quantum Inversion Redimensioning device which could alter their size. The process could not be reversed on Donatello, possibly due to his mutation, leaving him the size of an action figure. While the Utroms work on returning him to normal, Donatello put his new size to use infiltrating a terrorist organizations warehouse. He's also made a robotic body for him made to resemble a turtle to help him move around.
This incarnation of Donatello appeared in the "Turtles Forever" crossover special voiced by Christopher C. Adams.
Image Comics.
In the Image Comics incarnation of the TMNT, he became a cyborg after his body was partially destroyed after he was shot and dropped out of a helicopter (he maintained a positive attitude nonetheless, although he was constantly at risk of losing his mind to the cyborg half). He was supposedly killed by Image character Deathwatch by having his brain drained of mutagen. Leonardo blamed the cpu of Don's armor for his death; however, Donatello wasn't dead but was separated from his body, and with the help of his brothers he returned to his body. In the independent published series of the Image Comics, Issue #24, Don's armor began to malfunction and was so powerful Donatello was on his last legs until he made a deal with Baxter Stockman who Don was reluctant to work with but had no choice. Donatello is rid of most of his body metal by issue #25 and Baxter informs him his shell had regrown and as a result he was back to being a non-cyborg turtle. Baxter died once more when Don's metal particles wouldn't help restore his body; as a result Baxter requested Donatello give April O'Neil his regards and he died laughing maniacally. Donatello then went on to battle Lady Shredder and the foot clan with his brothers and Pimiko. Donatello was then by the end of the issue completely rid of all metal particles and had kept his and Baxter's ordeal a secret.
In the official IDW-published conclusion, TMNT Urban Legends, after Dr. X activated an EMP, the living armor abandoned Donatello for a new host, where it was discovered the armor had been impeding Donatello's natural healing abilities.
Archie Comics.
Donatello's appearance in the Archie publications were largely based on the 1987 Fred Wolf incarnation, but with Mirage writers on board at "Teenage Mutant Ninja Turtles Adventures" such as Steve Murphy and Ryan Brown, a lot of references to his Mirage counterpart were made. Donatello was showcased to be pure of heart and soul, being able to pass through the Netherworld unscathed. He was also chosen of the Turtles by a group of Aliens known as the Sons of Silence to share their wisdom. He was one of the few who could telepathically communicate with them. Donatello was almost a pacifist, detesting every time he used violence.
IDW Publishing.
In a shocking twist, Donatello was nearly killed at the end of issue #44 when Leonardo, Raphael and Michelangelo were on a mission to stop Krang from transforming the Earth using an alien device called the "Technodrome". Donatello was left at the home base, and while the others were away, he was attacked by Bebop and Rocksteady. After a brief fight, Rocksteady smashed Donatello's shell, nearly killing him.
The news of his supposed death spread all over the interview and IGN conducted an interview with script writer Tom Waltz, where he called the final scene a beautiful rendered scene, catching the emotion of the family. He also claimed there was no earthly way, Donatello could survive and he said it wasn't the end. Luckily, Donatello survived the onslaught.
In Issue #45, Donatello wasn't dead as his spirit was in an alternate plane and he was barely clinging to life. Leonardo, Michelangelo and Raphael carried Donatello's body into the freezer to slow down the bleeding and increase his chance of survival. Fugitoid says he needs to go to Burrow Island to get the equipment to save Donatello. Splinter finds Donatello's spirit and guides his son back to earth, however, due to Donatello wearing a helmet to keep his consciousness alive, his mind is in Metalhead, while his own body is being restored to how it was before his near demise.
In Issue #46, In Harold's lab, Donatello-as-Metalhead finishes prepping his body to be moved to the lair. He's trying his best to put on a brave face (so to speak), but being trapped in a robot body has been an upsetting experience. The Fugitoid tries to help Donnie adapt to having his mind in a robot body while Harold sees to Metalhead’s repairs (the robot having been trashed by Bebop and Rocksteady). Raphael storms off with Alopex following behind him. Raphael starts regretting leaving Donatello behind and seeing him in a robot body is too much for Raphael to handle, but as soon as Alopex and Leonardo give him some comfort he eventually accepts Donatello as Metalhead and he, Leo and Mikey go on patrol while Donatello and the Fugitoid transfer Donnie's turtle body to the lair of the turtles while Harold gets some equipment to help Donatello get back into his own body.
In issue #47, He mentioned to Fugitoid and Harold he is connected to his body's vital signs. Indicating he could still feel his body and was slowly getting back to normal. In issue #50, Metalhead self-destructed and Donatello returned to his organic body which has now been outfitted with an artificial shell. Since then he's been fighting alongside his brothers.
Television.
Donatello is a gifted scientist and mathematician. He does a lot of work with vehicles, technology, and experiments. Any science and math skill you can think of, he will do it all. 
Donatello is not as rowdy and violent as his brothers, but he can get a little annoyed with them on occasion. However he never loses his temper. Donatello is calm, sensible, quiet, friendly, and gentle. He doesn’t get into a lot confrontations with his brothers. He is more interested in his work than in his ninjutsu but he still attends to ninja practice and works hard there as well as his projects. 
In the fourth season, during an outbreak of mutations of people and animals in New York, Donatello got a nasty gash by a monster while fighting several monsters with his brothers. Then in the episode two-part episode “Return of Savanti”, Donatello ended up coming down with the sniffles. Later in the episode "Adventures in Turtlesitting", he went from a turtle who was home ill with the flu to a monster himself as a result of being infected by the outbreak. A similar situation happened with Raphael in the comics.
In the seventh season, also called "Back to the Sewer", Donatello blamed himself for Master Splinter's decompiling and vowed to restore his bits from cyberspace. This obsession caused him to disregard anything else, such as the gang war between the Foot Clan and the Purple Dragons, as unimportant. It wasn't until seeing his brothers in danger from the Cyber Shredder did he realize he was ignoring his responsibilities to help them and promised not to let his obsession with saving Master Splinter take control again. By the time of "Turtles Forever", the 2003 Donatello is in total disbelief over the scientific aptitude of his 1987 counterpart, in which the alternate Donatello replied, "Science isn't all about facts you know", although the two still manage to work together to track their enemies.
Movies.
Original trilogy (1990-1993).
In the first three live action films, Donatello, like Leonardo, is arguably less mature than he was in the Mirage comics and the 1987 animated series, as he is shown joking around more. The first movie never officially identifies Donatello as the group's resident "whiz kid", though he is occasionally shown tinkering with various devices and is seen to have a vast knowledge of obscure topics (he is shown to be a master at 'Trivial Pursuit' when playing against the other Turtles and later astutely labels Casey Jones a claustrophobic). He takes his time deciding on the most appropriate victory cheers, though his choices are sometimes quite perplexing (for example, "Bossa Nova!"). However, the second film clearly established Donatello as the most scientifically-minded turtle as well as the most introspective, feeling dejected when he learns that the ooze that created the Turtles only exists because of an accident, although Splinter consoles his dejection by pointing out that the circumstances of their origins cannot define their present worth.
The first film plays up the relationship between him and Casey Jones; in all other versions of the TMNT, Raphael, not Donatello, is closest to Casey, except for the 1987 cartoon, in which Jones does not figure prominently. This is apparently because the scene in which Donatello and Casey bond over the fixing of an old pickup truck was based on a similar scene involving Casey and Raphael in the Mirage comics. Corey Feldman famously provides Donatello's voice in the first and third live-action films, Ernie Reyes Jr. does all of the martial arts fight scenes and stunt scenes as Donatello, while Adam Carl filled in for the second movie during Feldman's stint in rehabilitation. In the third film, Donatello is the only Turtle who is not tempted to stay in the Feudal Japan of the past, saying that he can't live without technology. The films also portray Donatello as being close with Michelangelo, bantering with him during fight sequences, going off to the side when Leo and Raph are arguing, and in general hanging out in their spare time.
"TMNT" (2007).
In the 2007 film, Donatello runs an IT tech support line to earn money for the family and keeps an eye on Mikey. In the first half of the movie Donatello's skills are more focused on keeping the family together and on income than instead of inventing inventions and finding creative ways to solve problems. It is a combined effort of Leo being gone, Raph unable to control his temper and Donnie's leadership and logically minded skills that add up-to the reason as why he's been put into this position. With the combined efforts of all of these reasons is why Donnie and Raph argue more in this film than in most other depictions of their relationship. Raph is angry that Donnie has been named leader instead of himself while Leo is away and Donnie is angry that Raph hasn't been pulling his weight to support them. To add to this matter is the fact that Raphael was secretly fighting as the Nightwatcher. This disagreement is further explained in the prequel comics by the fact that Donatello does not trust Nightwatcher, because no one knows what side he is really on and because he uses fear to accomplish his ends. Donatello states that Raphael uses many of the same tactics, and hints that he may suspect what his brother really does at night. Donatello also tries to guide Michelangelo away from the idea that vigilantes are heroes. Such action depicts Donatello as a second-in-command while Leonardo is in Central America, forced to be the responsible one in Leonardo's absence and teach his brothers what Leo would in his place. Don is clearly yet still unofficially established as second in command here, much more than in the other three movies. However, Raphael felt he was better suited to be in charge and openly asks Splinter why he was not considered for the role. Splinter explains that Raph has not yet mastered control over his rage and is therefore not eligible to be leader.
In this film, Donnie also seems to show a bit more emotional care for Mikey than in the previous films. According to the short "Mikey's Birthday Party" Donnie helps Mikey with his job as a character entertainer named "Cowabunga Carl" by communicating with Mikey via cameras and head gear in order to remind him to hand-out flyers and to get cash (not checks). This seems to irritate Mikey to a large degree. (The 2007 movie never mentions age as a deciding factor). In the game tie-in his IQ is "off the charts". Don is voiced by Mitchell Whitfield.
Reboot (2014).
Donatello appears in "Teenage Mutant Ninja Turtles" portrayed by Jeremy Howard. In this film, Donatello the brains of the team and relies heavily on high-tech equipment and gear. His personality in this film is very calm and measured, and was also given a much more nerdy portrayal than in previous adaptations, on account of his large glasses with the middle taped. He also has a similar personality to his 1987 and 2003 counterparts where he is always talking of calculations and constantly confusing his brothers with them. He is also the one who stopped the toxic poison that Shredder had activated on Sacks Tower. Like Michelangelo and Leonardo, Donatello wears a glove on his left hand, has a tech pack on his shell and boots although you can partly see his toes making only him, Raphael and Michelangelo the only turtles to stay true to their other incarnations with the two toes. Donatello appears in the sequel, "".
DC crossover film.
Donatello appears in the direct-to-video crossover film "Batman vs. Teenage Mutant Ninja Turtles", voiced by Baron Vaughn.
Video games.
In the video games based on the 1987 animated series, Donatello has the longest range, although he cannot inflict as much damage as Leonardo, who has the second-longest range; one notable exception is the first NES game, where Donatello both did the most damage and had the longest range, though his attacks were slow. This has been carried over into the games inspired by the 2003 animated series. In ", he is voiced by Sam Riegel.
Donatello is one of the main playable characters in ", where he is voiced by Yuri Lowenthal. Donatello also appears in the 2014 film-based game, voiced by Oliver Vaquer.
Donatello will be featured as one of the playable characters from Teenage Mutant Ninja Turtles as DLC in "Injustice 2", voiced by Joe Brogie. While Leonardo is the default turtle outside the gear loadout, he, Michelangelo and Raphael can only be picked through the said loadout selection similar to the premier skin characters.
Donatello is featured as TMNT season pass in Smite as a Wukong skin voice by Landon McDonald.