From SmashWiki, the Super Smash Bros. wiki
たつまん (Tatsuman, often incorrectly romanized as Tatuman) was a top-level Smash 64 player from Japan who mained Kirby, but was also highly proficient with every character. He is the only known player to have beaten Jousuke in a twelve character battle, winning by one stock.
From 2006-2008 he was the best player in Japan, winning the first Kanto and Kansai tournaments. In late 2006 when Isai travelled to Japan he won a game with Fox against Mario, but usually got defeated.
Notable tournament placings
Super Smash Bros.