Aside from mind control I have only one other fetish, which I suppose goes hand in hand with it: sedation. I'd love to see more well-drawn knockout scenes, preferably via gas/powder or dart/injection. Said scenes leading to a subsequent brainwashing session would also, obviously, be welcome :3 . I suppose submission turns me on more than anything...
As far as sub-categories of mind control go, if those aren't redundant in this topic... where to begin? I long to see more invasive tech-control (plug-ins, nanobots, implants, etc...) here, as well as relatively drawn-out possession scenes ("These... aren't my thoughts!!"), and more intricate magic than just love potions and hypno-beams (magic that requires tricking the sub into meeting a condition, or spells that manifest as interesting things like prisons, creatures... puppet strings o///o). More psychic stuff! Siren songs, hypnotic touch, hypnotic light, cocoons, virtual reality, mass triggers, less-typical personality shift... I don't know. Lots of underexplored possibilities in this fantasy.