Wario is a character of the Super Mario series. He has appeared a few times alongside Bomberman throughout the years. The only notable ones are the game Wario Blast and the comic Wario's Christmas Tale.
Wario Blast: Featuring Bomberman!
Wario discovers a gateway into Bomberland, and being the greedy individual he is, seeks to loot it for his own gain. His main objectives are to steal as much treasure as possible, and use Bombs and other items to battle with and defeat the numerous Bombermen who are trying to stop him from decimating their world.
Wario's Christmas Tale.
This comic was part of the Club Nintendo comics that were released only in Germany. Wario takes on the role of Ebenezer Scrooge in a parody of the Charles Dickens novel A Christmas Carol. Wario owns a bomb shop, and his primary sales clerk is Bomberman.