Ángel/Story

The King of Fighters 2001
Prior to the 2001 tournament, Angel was tasked to form a team with Foxy, Kula Diamond, and the cartel's newest creation, K9999. Their main purpose was to dispatch the rogue creations that had escaped from NESTS's grasp, as well as disposing K', Kyo Kusanagi, and anyone who would get in the cartel's way. She did seem to enjoy working with K9999, as he seems to have the same interests at heart.

Sometime after the tournament's conclusion (when K', Maxima, Whip, and Lin were reaching Igniz via a blimp), K9999 and Angel attack Foxy from behind, fatally injuring her. When the NESTS base crashed into the ocean, it is instead implied that Angel stayed behind to try and destroy NESTS' base for good while K9999 left on one of the Ikari Warriors' helicopters.

While it is implied that Foxy is killed by him and Angel, this ending is considered non-canon. According to the second 2001 novel written by Akihiko Ureshino, she disappears after an encounter with K' and Kula alongside K9999.

The King of Fighters XIV
Because Angel defected from NESTS, she has been constantly on the run and is hunted by NESTS loyalists, with K9999 having to mysteriously disappear. Prior to the fourteenth tournament, Ramón offers her an invitation to join the tournament, which she accepts, tired of living in the shadows and in the mood to do something.