Also, I don't like when people want to play characters which are half-human, half-elf, half-vampire, half-alien or something ... all in one person. And of course that character has to have all kinds of powers, too. -rolls eyes-
Sounds like Ichigo from Bleach
Several things has been mentioned here, but I'll rehash some stuff
Passive RPing really grinds my gear a lot. It's one thing to want someone to help you set the scene, but it's another thing when the only thing you write is the answer to my character's question, and that's it. They'd write some form of thinking process, but in the end the only thing I get to draw inspiration for my next post was only "Yeah, that sounds about right". I do not mind carrying the plot forward, but if that's what you're going to just post everytime I wrote, I might as well godmod your character and write my own story.
By the same token, I do have to say that some form of Godmodding is rather necessary, especially if you're doing something that's so mundane that you're practically just wasting time. The way RP work is that one person do something, the other reacts, and then the first person reacts to that, which would extend the interaction to an unnecessarily long degree. Of course, communication is key, so I'd usually ask if we can just time skip the RP (mostly only works during 1x1 RP), and skip the mundane details, because you can't just keep talking for hours upon hours, before you run out of things to explore. As long as it's agreed upon, I'm fine with it.
Which brings me to my next peeves, which is complete disregard of time. This is why sometimes I prefer 1x1 to a group RP, because with 1x1 RP, only two people is involved, so if it's necessary, we could agree to time skip some unnecessary parts. In a group RP, you have to contact several people, notify them that a time skip is going to happen (either through sleeping, traveling, or etc.), and pray to the Gods that they agreed to that time skip. This is especially troubling because in a group RP, every character progresses their characters differently, and some are more of the quick-love kind of stuff, and some are the slow burn kind of stuff, so you'd have one pair going at their relationship development vehemently, and cannot be bothered, while the rest is trying their hardest to come up of stuff to do while waiting for that pair to finish so that the time skip can happen (for example, two pair already made promises to meet somewhere tomorrow, or continuing their business tomorrow, while one pair is still talking, and these two would just keep on spawning NPCs and making events happen to rush through the progression).
I am on the slow burn party by the way, which is why I'd prefer if my RP has a proper sense of time progression, because no matter how much we type, if we do not type that time has passed, in the RP world time stood still, and that's detrimental to the slow-burn progression. It's a rule I made for myself, but I usually try to put at least a week in RP time of interaction before taking it to the next level, so progressing one day is important to me.
Anyway, a funny/dreadful story to end
I once got into a group RP in highschool situation, and I got in pretty late into the story. It was like, 100+ pages, or 1000+ pages, I forgot, but there's really a lot of progress already, so I got in, got with another F, gone to third base all the way to home base WITHIN THE FIRST DAY they met (Yes, I'm still ashamed of that blind rut stage where I just RP for the smut), the girl got pregnant (yes still on the same day), and got abortion due to gang attack by rival school member (still on the same day). That's not even the worst part, because I joined in pretty late, and it's only day 3, in RP day 3.
And within that 3 day, there has been several pregnancy, several abortion, two marriage, one divorce, one NTR situation, one mafia situation where the NTRd girl wants revenge, someone actually got killed, for real, several new 'transfer student', several expulsion (due to inactivity), and whole lot of smut.
And it started as a simple Vocaloid highschool slice-of-life.