Mature appears as a member of Iori's Team in The King of Fighters '96. She is one of the Hakkesshu, Mature joins forces with Vice to serve her master, Orochi. She often takes orders from Leopold Goenitz, although she doesn't like him. She and Vice were ordered to keep an eye on Rugal Bernstein, who was trying to use Orochi's power. They posed as his secretaries.

When Rugal died, Goenitz ordered Vice and Mature to keep an eye on Iori Yagami and bring him to the 1996 tournament. They didn't win the tournament, but when Kyo Kusanagi and Iori defeated Goenitz, Iori entered the Riot of the Blood and killed Vice and Mature. Although dead, both women continue to haunt Iori as shadows to entertain themselves.

(Source: SNK Wiki)