After weeks of speculation and WWE themselves covering the rumors of Styles leaving NJPW for WWE, on January 20, 2016 it was confirmed that he had signed with WWE.
Prior to signing, Styles had also had extensive discussions with TNA and according to them, Styles had agreed to return to the promotion with Bullet Club stablemates Doc Gallows and Karl Anderson, before being offered a "blow-away deal" by WWE.
After not being on WWE television since his Metal match in 2002, Styles made his re-debut in WWE on January 24 at the Royal Rumble pay-per-view during the Royal Rumble match for the WWE World Heavyweight Championship, entering at number three.
Styles went on to eliminate Curtis Axel and Tyler Breeze, before being eliminated by Kevin Owens, lasting just under 29 minutes in the match.
Styles then entered a storyline with Chris Jericho, with the two exchanging victories on both Raw and SmackDown, which ultimately led to an encounter between the two on February 21 at Fastlane, where Styles emerged victorious via submission.
After Fastlane, Jericho and Styles formed a tag team, dubbed "Y2AJ", and went on to defeat The New Day (Big E and Kofi Kingston) in two non-title matches.
This led to a match for the WWE Tag Team Championship on the March 7 episode of Raw, which Y2AJ failed to win, after which Jericho turned on Styles and attacked him, officially ending their team.
The two subsequently interfered in each other's matches, leading to Styles challenging Jericho to a match at WrestleMania 32, which Jericho ultimately accepted on the March 28 episode of Raw.
At WrestleMania 32 on April 3, Styles lost to Jericho.

On the following episode of Raw, Styles won fatal four-way match to become the number one contender for Roman Reigns' WWE World Heavyweight Championship.
In the weeks that followed, Styles reunited with former Bullet Club stablemates Luke Gallows and Karl Anderson (now known as The Club) and an alliance, which Styles initially denied, was teased.
At Payback on May 1, Reigns eventually defeated Styles by pinfall after the match was restarted twice (with Styles first winning by countout and then by disqualification), despite Gallows and Anderson's interference.
Styles received a rematch against Reigns for the championship at Extreme Rules in an Extreme Rules match, but was unsuccessful due to interference from both Gallows and Anderson and The Usos (Jey and Jimmy Uso).
The following night on Raw, Styles failed to qualify for the Money in the Bank ladder match at Money in the Bank against Kevin Owens.
On the May 30 episode of Raw, he welcomed back a returning John Cena, only to attack Cena with help from Gallows and Anderson, turning heel in the process.
This set up a match between Styles and Cena at Money in the Bank on June 19, which Styles won after interference from The Club.
At Battleground on July 24, The Club took on Cena and Enzo Amore and Big Cass in a six-man tag team match, where they lost after Cena pinned Styles.
During the 2016 WWE draft, Styles was drafted to the SmackDown brand in the first round of picks, being the brand's second pick overall, while Gallows and Anderson were drafted to the Raw brand, splitting up The Club.
Styles faced Cena once more at SummerSlam on August 21, which Styles won again.
After his victory over Cena, Styles claimed himself to be the "new face of WWE" and "the Face That Runs the Place".

Due to his victory at SummerSlam, Styles immediately re-entered the renamed WWE World Championship picture and received another opportunity at the title at Backlash against Dean Ambrose.
At the pay-per view on September 11, Styles defeated Ambrose to become the WWE World Champion for the first time after a low blow, also his first championship in WWE and eighth world title overall.
Styles made his first successful title defense against Ambrose in a rematch on the September 27 episode of SmackDown after interference from John Cena.
At No Mercy on October 9, Styles retained the title against Cena and Ambrose in a triple threat match after pinning Cena.
At Survivor Series on November 20, Styles m
After weeks of speculation and WWE themselves covering the rumors of Styles leaving NJPW for WWE, on January 20, 2016 it was confirmed that he had signed with WWE. Prior to signing, Styles had also had extensive discussions with TNA and according to them, Styles had agreed to return to the promotion with Bullet Club stablemates Doc Gallows and Karl Anderson, before being offered a "blow-away deal" by WWE. After not being on WWE television since his Metal match in 2002, Styles made his re-debut in WWE on January 24 at the Royal Rumble pay-per-view during the Royal Rumble match for the WWE World Heavyweight Championship, entering at number three. Styles went on to eliminate Curtis Axel and Tyler Breeze, before being eliminated by Kevin Owens, lasting just under 29 minutes in the match. Styles then entered a storyline with Chris Jericho, with the two exchanging victories on both Raw and SmackDown, which ultimately led to an encounter between the two on February 21 at Fastlane, where Styles emerged victorious via submission. After Fastlane, Jericho and Styles formed a tag team, dubbed "Y2AJ", and went on to defeat The New Day (Big E and Kofi Kingston) in two non-title matches. This led to a match for the WWE Tag Team Championship on the March 7 episode of Raw, which Y2AJ failed to win, after which Jericho turned on Styles and attacked him, officially ending their team. The two subsequently interfered in each other's matches, leading to Styles challenging Jericho to a match at WrestleMania 32, which Jericho ultimately accepted on the March 28 episode of Raw. At WrestleMania 32 on April 3, Styles lost to Jericho.
On the following episode of Raw, Styles won fatal four-way match to become the number one contender for Roman Reigns' WWE World Heavyweight Championship. In the weeks that followed, Styles reunited with former Bullet Club stablemates Luke Gallows and Karl Anderson (now known as The Club) and an alliance, which Styles initially denied, was teased. At Payback on May 1, Reigns eventually defeated Styles by pinfall after the match was restarted twice (with Styles first winning by countout and then by disqualification), despite Gallows and Anderson's interference. Styles received a rematch against Reigns for the championship at Extreme Rules in an Extreme Rules match, but was unsuccessful due to interference from both Gallows and Anderson and The Usos (Jey and Jimmy Uso). The following night on Raw, Styles failed to qualify for the Money in the Bank ladder match at Money in the Bank against Kevin Owens. On the May 30 episode of Raw, he welcomed back a returning John Cena, only to attack Cena with help from Gallows and Anderson, turning heel in the process. This set up a match between Styles and Cena at Money in the Bank on June 19, which Styles won after interference from The Club. At Battleground on July 24, The Club took on Cena and Enzo Amore and Big Cass in a six-man tag team match, where they lost after Cena pinned Styles. During the 2016 WWE draft, Styles was drafted to the SmackDown brand in the first round of picks, being the brand's second pick overall, while Gallows and Anderson were drafted to the Raw brand, splitting up The Club. Styles faced Cena once more at SummerSlam on August 21, which Styles won again. After his victory over Cena, Styles claimed himself to be the "new face of WWE" and "the Face That Runs the Place".
Due to his victory at SummerSlam, Styles immediately re-entered the renamed WWE World Championship picture and received another opportunity at the title at Backlash against Dean Ambrose. At the pay-per view on September 11, Styles defeated Ambrose to become the WWE World Champion for the first time after a low blow, also his first championship in WWE and eighth world title overall. Styles made his first successful title defense against Ambrose in a rematch on the September 27 episode of SmackDown after interference from John Cena. At No Mercy on October 9, Styles retained the title against Cena and Ambrose in a triple threat match after pinning Cena. At Survivor Series on November 20, Styles m
A.J. Styles