Simply put, a yandere falls in love with you, blah blah blah. Request a character from the short list of games, any requirements for the story and whether you want it to be short, long or either.
You can request characters from
Persona 3(Theodore and female protagonist included)
Persona spinoff characters (Zen, Labrys and Kanami only. Rei is A. dead, and B. too sweet cute and innocent to hurt anybody.)
Story of Seasons
If you're fandom isn't here, ask me! Do note, you'll likely be low on my list of priorities.