Bomberman ending up going from Planet Bomber to Earth and having to remain hidden from humans, this ties back to a loose concept for an AU where Bomberman was in the Sonic X anime where Bomberman after saving Planet Bomber went on vacation to Earth around the same time Sonic and co got sent by Chaos Control to Earth, he ends up either being the one found by Chris and not Sonic or just simply parks his ship in the forest and remains hidden until he makes his debut helping Sonic fight Eggman and either moves into the mansion or simply continues living in the forest, a variant of this concept had Bomberman landing on Earth and interacting with the worlds and franchises previously mentioned somehow.

Bomberman ending up in Cyberspace either in the Digital World from Digimon or the Cyberworld from Mega Man Battle Network/NT Warrior

Also Bomberman interacting with magical girl shows EG Sailor Moon Lolirock etc