What did the illustrator of a well-known manga starring Goku first achieve mainstream recognition for?
Dragon Ball (manga): Dragon Ball (Japanese: ドラゴンボール , Hepburn: Doragon Bōru ) is a Japanese manga series written and illustrated by Akira Toriyama. Dragon Ball (manga):  The story follows the adventures of Son Goku, from childhood to adulthood, as he trains in martial arts and explores the world in search of the seven orbs, known as Dragon Balls, which summon a wish-granting dragon when gathered. Akira Toriyama: Akira Toriyama (鳥山 明 , Toriyama Akira , born April 5, 1955 in Nagoya, Aichi) is a Japanese manga and game artist. Akira Toriyama:  He first achieved mainstream recognition for his highly successful manga "Dr. Slump", before going on to create "Dragon Ball"—his best-known work—and acting as a character designer for several popular video games such as the "Dragon Quest" series, "Blue Dragon" and "Chrono Trigger".
Dr. Slump