Wario is a significant character in the Mario series, making his first appearance as the villain of Super Mario Land 2: Six Golden Coins (1991). He is the rival and antithesis of Mario, being much bigger, stronger, and plumper. Wario is notoriously greedy and obsessed with money. Although initially appearing as a villain, he occasionally allies with Mario and is seemingly on good terms with him, but is nonetheless concerned primarily with himself. In many of the spin-off games, he appears with his partner in crime, Waluigi, but their actual relationship is unclear.
In the Wario Land subseries, Wario goes out on adventures in search of treasure, battling the likes of pirate Captain Syrup and the diabolical Rudy the Clown. The WarioWare Inc. subseries showcases the business-savvy side of Wario, in which he founds a video game company with his friends in order to bring himself more profits.