My RP began from playing D&D over text so much of my preferences come from that. I like message-response interactions similar to the dm-player dynamic. I can also run adventures with romance/smut, giving a balance of story and smutty material.
I also like RP involving monstrous partners, played by myself or my partner with either the male or female being the larger partner. My expertise is with dragons but I also enjoy running minotaur, naga, etc. I can be the one dominating or dominated, I have no preference. I run what I call Monsters with Safewords: the submissive party still has control and can stop things if they go past their level of comfort.
I am tragically male/heterosexual, I do not get sexual gratification from mlm relationships. I also do not enjoy abusive/violent relationships or aggressive/degrading speech.