Tomichin is a parody character, a caricature of Atsushi Tomita, who was assistant designer in X-Men: Children of the Atom and Marvel Super Heroes and main designer in X-Men vs. Street Fighter, Marvel Super Heroes vs. Street Fighter and Marvel vs. Capcom: Clash of Super Heroes. "Tomichin" is a nickname he was given by the development staff, and the caricature bears a striking resemblance to Bert from Sesame Street.
Tomichin first appeared in the Secret File (a special booklet bundled with Arcade releases) for Marvel Super Heroes vs. Street Fighter, as a stand-in for Tomita in a two-page interview where he discusses the game's characters. The image also includes a small profile with a parody movelist listing two special attacks and one Hyper Combo:
- + - I'm Sorry, I Forgot (ごめんなさい、忘れてました, gomennasai, wasurete mashita)
- + - There it is!! (それですわ！！, soredesuwa!!)
- + - Absolute Fusion (絶対合体, zettai gattai), a reference to Capcom's Arcade game Side Arms.
Later, sprites and an announcer voice for a Tomichin assist character were found buried within the code in Marvel vs. Capcom: Clash of Super Heroes, although whether he was an idea for an assist character dropped during development, a test character for the assist system or simply a joke included in the graphics table by the artists, is unknown. The sprite set shows what would be very rough animations for Tomichin rising a fist and being knocked down, as well as a single sprite where his nose extends and forms a fist.