Aska is a character appearing exclusively in the Super Nintendo version of Tournament Fighters. She is a young kunoichi who participates in the tournament in order to start her own academy, she is allied with the Turtles and is the only female heroine in the game. She has long hair with a hachimaki wrapped around her head, a red bathing suit, and the upper half of a white gi. Other than perhaps being a bit of a misandrist (due to some of her in-game dialogue), she is given little characterization.
Although rumors as to the reason she was made for the game are numerous, Aska actually started out as Mitsu, as seen whilst combing through the coding of the beta version of Tournament Fighters. It is unknown why she was changed into an original character prior to release, although the third movie's dismal reception may have played a part.
Aska wields twin kunai and has the ability to conjure winds. Some of her movements show a trail of cyan butterflies, which may be created by her abilities. Aska also has a few provocative attacks, which involve leaping at her foe with her buttocks, as well as a throw that features her jamming her opponent's face in her crotch.
Aska's sprite differed between the later Japanese release and the United States version. Her leotard is more skimpy in the Japanese version, exposing her butt cheeks more in moves in which they are visible. Her winpose also causes her breasts to bounce in Japan; this was changed in the U.S. release. Many fans spell her name as Asuka (アスカ) athough in the Japanese version of the game, Mutant Warriors, it is still spelled A-S-K-A.
Due to being one of the few female characters to see active combat in the series, as well as being relatively obscure, Aska retains a respectably-sized fanbase. Aska was rated as #4 on the list of "Top Ten Fighting Women" by Electronic Gaming Monthly in 1993.