Ataru Moroboshi, the main character from Rumiko Takahashi's manga and anime series Urusei Yatsura
In another Japanese reference, the banners around the arena are written in Japanese hiragana and spell out Ataru, Lum, urusai yatsura (a misspelled reference to Urusei Yatsura), Kei, Yuri, Akira and Tonari no Totoro.
Stephen Karl Rassin (born 1967 in Wilmington, NC), better known as Steve Rassin, is an American voice actor best known as the voice of Ataru Moroboshi in 5 of the 6 Urusei Yatsura movies.