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During Sion Tatari's Last Arc Drive, Riesbyfe Stridberg will make a small appearance. But it was not until Melty Blood: Actress Again she made her debut as a playable character.
Trivia Image for "Protoryuken"
Trivia Image for "Eiffel 65 Likes Tekken."
A character named Ivan was supposed to be added in the game, but was left out for unknown reasons. He can still be seen in the intro movie.
In Tekken Bowl, Dr. Boskonovich can be seen on the left side. If you are skilled enough, you can knock him down.
In Magical Girl Lyrical Nanoha A's Portable: The Gears of Destiny, one of Fate Testarossa's costumes resembles Klonoa from the game "Klonoa: Door to Phantomile". Pac-man can be seen on her cap as well or atleast it is supposed to resemble him.
Doujin developer
Hidden in the code of Marvel vs. Capcom's arcade release is this fellow who looks an awful lot like Sesame Street's Bert. His name is Tomichin, and he's apparently a caricature of Atsushi Tomita, who is credited as "Planner" in several of the series' entries. Drawings of Tomichin also shows up in some marketing materials for the Marvel vs. series, whenever Tomita gives a public statement. Tomichin appears to have been at one point planned to be a striker. He has animations for a quick hand swipe, getting hit/falling down, and strangely enough, having a fist stretch out of his nose. Rumors insist that Tomichin was planned to be the playable bonus character in Marvel Super Heroes vs. Street Fighter, but no evidence can be found of that.