She first appeared in KOF 2001 as a member of NESTS. Along with Ramon, she was given Mexican nationality to appeal to the South American market. She features a curvaceous body and a bizarre, highly revealing outfit consisting of a leather jacket, sports bra, and leather panties with chaps instead of pants. Combined with her kidult nature, airheadedness, ditzy charm, my-pace attitude, nasal voice, and a fighting style that involves wide-legged stances, she is said to be a 100% reflection of designer Styleos's (Toshiyuki Kotani) personal tastes. Furthermore, she introduced the radical 'Unchain System,' which makes her difficult to master, but once learned, she can become one of the strongest characters in the game. Contrary to her manner of speaking, she has a violent and sadistic side, and her true personality remains somewhat mysterious. However, she seems less dangerous than K9999; in 2001, while Foxy was particularly wary of K9999 when contacting Diana, she didn't seem to view Angel as a major problem. In the manhua adaptations where she appears as An-Gi-A, she remained relatively calm, perhaps because K9999 was rampaging so excessively. As a side note, she met the human Guest by chance. They became close as they discovered their hobbies and interests were similar yet complementary. Eventually, even after Guest learned her secret as a NESTS agent, Guest boldly took the place of her lover. They have since developed a sticky, dense romantic relationship where they have shared everything. This became a hot topic even among the NESTS members, and thanks to that, Guest has come to be on good terms with the rest of NESTS as a close friend.