Naoto Ohshima is a Japanese artist and video game designer, best known for designing Sonic the Hedgehog and Dr. Eggman characters from Sega's Sonic the Hedgehog franchise. Although Yuji Naka created the original tech demo around which Sonic's gameplay was based, the character in his prototype was a ball that lacked any specific features. Sonic Team considered numerous potential animal mascots before deciding on Ohshima's design, with an armadillo or hedgehog being the top choices because their spikes worked well with the concept of rolling into enemies.

Sonic the Hedgehog is a character created by the Japanese game developers Yuji Naka and Naoto Ohshima. He is the star of the Sonic the Hedgehog franchise and the mascot of the Japanese video game company Sega. Sonic is an anthropomorphic blue hedgehog who can run at supersonic speeds. He races through levels, collecting rings and avoiding obstacles, as he seeks to defeat his archenemy, Doctor Eggman. He is accompanied by supporting characters, such as his sidekick Miles "Tails" Prower, self-proclaimed girlfriend Amy Rose, and friendly rival Knuckles the Echidna.