Gaidel is the father of Leona. He was a member of the Hakkesshu and an avatar of water. Like he did with the rest of the Hakkesshu, one day Leopold Goenitz visited the village where Gaidel, his wife and Leona were. Goenitz asked for help to ressurect Orochi, but Gaidel refused. Goenitz left but returned later that night and activated the Riot of the Blood within Leona, who killed her father, her mother and everyone else in the village. In the Ikari Team's ending Gaidel was seen talking to Leona and told her not to follow Orochi and his destiny, but to follow her own fate.