Psycho Fox was released in 1989, and is my favorite game on the Master System. It's not a terribly competent platformer, but I always loved playing it. It makes me sad that Sega hasn't given the game any recognition at all since it was released - no cameos, remakes, sequels, or even just a blinkin' Virtual Console release. It's probably the only Sega property I love that gets treated worse than Streets of Rage.
PF's appearance isn't super consistent, between the cover art, the in-game sprite, and his appearance on the title screen. I cobbled together some aspects from each and slapped it onto a Classic Tails, with sculpted sleeves and toes.
When I was really young, I was actually convinced that Psycho Fox was Tails' older brother. Heh.