Even though I don't really rp, when I do its usually to try and get inspiration for a hypno fanfic I'm working on so I want it involving one of the franchises I'm using like Ty Lee from Avatar or Raven from Teen Titans or Miranda and others from Mass Effect etc.
As far what I like to write (and by extension rp) is slow burn inductions where the girl is resisting, transformations/corruptions- particularly into succubi or fembots or twinning/cloning into another character and especially if its infectious like a bimbo virus.
I also like gentle dom where the tist is making sure the sub is genuinely enjoying being controlled. Or romance where one or both parties find love through hypnosis or a couple is using mind control as a means to display their trust and love for each other.
Atm I am trying to finish a Fairy Tail hypno fanfic that will have a huge variety of hypno scenes including: hypno drinks, hypno music, hypno massages, stage hypnosis, dollification, bimbofication, stepfordization, etc.