Waluigi first appeared in Mario Tennis in 2000 for the Nintendo 64, created as Wario's lanky partner and a rival to Luigi. Voiced for decades by Charles Martinet, the character became known for theatrical boasting and dramatic self pity, including his number one claim. Clips of the line spread through gaming forums, YouTube edits and soundboards, where the short boast was isolated for quick reactions. It remains popular because Waluigi rarely gets the spotlight in mainline games, making his loud confidence feel funnier and more memeable.