SPAMMERS. When it's two people who keep posting over and over after one another, and before the day is over, they have like 100 posts in the thread, and they still keep at it, not letting anyone catch up, even when people tell then to SLOW THE HELL DOWN.
I remember one RP I was in on another forum, very very good plot and base story to it. The guy must of had a lot of time thinking about it, after like a day in, two people had already spammed the whole thread, mainly with stupid ass shit that didn't make sense to the THREAD PLOT anymore. (Or getting off topic. >_>)
Now, I can see if most of the people have left the thread, and two people want it to keep going, and they know how to make a good story out of it, and adding new characters and stuff to make it sound good, without having the same two characters mentioned all the time. I've done it, and the person I was with, we managed to make the thread 14-15 pages long, without getting off topic, and staying to the plot. (and we didn't post after each other like every minute or so, we still made it a good few hours wait to a day, letting people read the thread and see if they wanted to join. >>)
Anyway, SPAMMING threads is not cool people... T_T Another I can see, is if the thread is in a part that only cause for two characters for awhile, that is understandable.
Also, GODMODING is fucking annoying. >_< Not going into s rant with this XD, I think someone has already pointed out anyway, but I hate when someone's character may be on the edge of dieing and they make them go all SUPERMAN and kill the other's character. And they're all fine, and they make their character all badass and shit. Any godmoding in an RP, unless the RP calls for it, annoys the living fuck out of me, makes me want the shoot the person. >_>
Anyway, done with my ranting for the day... o_o >> <<