Vivid

Vivid, as a character based on Vivid (who isn't even registered on the forums) has appeared in several OGs.

Gamehiker High University

Vivid is a freshman student. However Headmaster Mune only allows a maximum of three female students due to his sexism, so Vivid initially disguises her as a guy. In the first GHU, Vivid befriends Kester, who becomes suspicious of her due to detecting the distinctly female skepticism of Agent Scully in her and becomes bent on proving her to be a girl. In GHU 2, Kester has gotten over that idea and instead tries proving her to be an alien. Golem discovers her secret after walking in on her in the bathroom, and she later reveals her identity to Kester while giving him a kiss on the cheek due to feeling sorry for him.

However, soon afterwards Kester was vaporized by Gamechamp, with Vivid as the sole witness. He threatened to expose her gender if she told anyone, but afterwards Vivid began disguising herself as Kester to remain at the school. In Gamehiker High University 3: Finals Finale!?, Vivid freely reveals her gender once Masamune and Murasame's schools are combined and she also calls out Gamechamp, although some of that may or may not have happened due to that whole OG having been a dream sequence.

She has not yet appeared in Gamehiker High University Special: Politi-Cal! so her current status is unknown- although with Kuria's recent expulsion GHU currently has an extra female slot.