Alpacaman

Alpacaman is a so-called uglycute character that appears in its own video games. The only known video game thus far is the popular video game Alpacaman 2 released 2000, a virtual pet video game where you speak to Alpacaman via a microphone to which he responds. Sometimes he does not seem to respond, though. Rintaro Okabe mentions that this video game cost him 500 yen and that headphones were included with the game.

In one of the worldlines that appears in Linear Bounded Phenogram Rintaro Okabe dresses up as Alpacaman and disguised tries helping others along with Mayuri Shiina.

Trivia

 * This game is likely a parody of the Sega Dreamcast video game Seaman.