She was a manga only character. The Headmistress of Holy Forest Academy.
She's the second adminstrator at the Holy Forest with a mole, at the right side (her left) of her face. Fukuroda was the first.
She have a really busty figure. It's rumored that they are at least a 'D' size.
As the administation of Holy Forest Academy attempts to move on with things, especially after the recent incident that Suguru Teshigawara kidnapped Fuyutsuki and gunned Onizuka (Manga Volumes 18 & 19). A faction had decided to usurp the current chairman Sakurai via held her responsible, while forcefully expel troubled human factors. The role are carried out by Ms. Daimon comes to Holy Forest soon after, injecting yet even more 'fun' and 'chaos' to the students' and facility's lives. And of course this means another enemy to make Onizuka's job more difficult and interesting. The thing she does/her methods seems rather clever and interesting. It's interesting to see what she throws out at Onizuka and how HE will get to her eventually.
Not does she have an agenda of ridding Holy Forest of Onizuka, she has her sights/targets on more liberal Mrs. Sakurai for personal reasons. Like most of the incidents in GTO, someone has something against a teacher for something that has happened (in the past), and Daimon has that right here. The reasons why she was brought over to Holy Forest and her 'style' / 'philosophy' of running a school/reforming it gets revealed in Manga Volume 24.