The manga guest character who appears in the PlayStation version of Tekken 3 is Gon.
Gon is the small dinosaur protagonist of the Japanese manga created by Masashi Tanaka. Namco added him as a special guest character to the home conversion of Tekken 3, making him one of the game’s hidden console characters rather than part of the original arcade roster.
Gon is unlocked through the PlayStation version’s extra content and is notable for his tiny size, unusual animations, and attacks that fit his comic-book identity. His inclusion helped distinguish the console release from the arcade game, which had a different character lineup and fewer bonus features.
Players sometimes confuse Gon with Alex, the genetically altered dinosaur from Tekken 2. Alex is an original Tekken character and a boxing-based fighter, whereas Gon comes from an external manga series. Noctis, Geese Howard, and Akuma are guest fighters from other fighting-game crossovers and do not appear in Tekken 3.