I'll keep mine vague, short, and brief based off over a decade and a half of MMO RP and RP experiences in general. Some of these have been listed already but never hurts to have a repeat for the people in the back:
- OOC Clinginess (if it's IC and stays there, don't worry about it)
- Unapproved Possessiveness (some RP partners like to be possessive of each other's characters and time and when it's agreed upon and goes both ways? Coolio)
- Roleplay Exclusivity (when one person doesn't like when you go and RP with someone else be it another character, player, group, or even on another game)
- Belittling Everyone Else You RP With (whether it's about their character, OOC habits, or otherwise this tends to be a large warning sign. Keep in mind, however, that if you complain to this RPer/RP partner about only the bad things about people then they'll only know the bad sides and not the good. Check that you aren't unintentionally making them biased)
- Creeping On Your Other RP (parking near where you're RPing with another person, not saying anything, and just lamping. This can be an especially big warning sign if they hunt you down in the open world and park nearby to watch you RP even if you didn't invite them. If you invite them or they ask to lamp? That's different)
- Passive Aggressiveness (this can sometimes be tricky because tone doesn't always infer well via text)
- Guilting You (making you feel guilty over not RPing with them enough or RPing more with others than them)
- Mixing IC And OOC (this one speaks for itself)
- Metagaming (also speaks for itself)
- Controlling Tendencies (like coaching you to post/write a different way to please them, making you change your character to appease them, trying to micromanage your time for you, etc.)
These are only a few. But they tend to be some of the bigger ones to watch out for.
- OOC Clinginess (if it's IC and stays there, don't worry about it)
- Unapproved Possessiveness (some RP partners like to be possessive of each other's characters and time and when it's agreed upon and goes both ways? Coolio)
- Roleplay Exclusivity (when one person doesn't like when you go and RP with someone else be it another character, player, group, or even on another game)
- Belittling Everyone Else You RP With (whether it's about their character, OOC habits, or otherwise this tends to be a large warning sign. Keep in mind, however, that if you complain to this RPer/RP partner about only the bad things about people then they'll only know the bad sides and not the good. Check that you aren't unintentionally making them biased)
- Creeping On Your Other RP (parking near where you're RPing with another person, not saying anything, and just lamping. This can be an especially big warning sign if they hunt you down in the open world and park nearby to watch you RP even if you didn't invite them. If you invite them or they ask to lamp? That's different)
- Passive Aggressiveness (this can sometimes be tricky because tone doesn't always infer well via text)
- Guilting You (making you feel guilty over not RPing with them enough or RPing more with others than them)
- Mixing IC And OOC (this one speaks for itself)
- Metagaming (also speaks for itself)
- Controlling Tendencies (like coaching you to post/write a different way to please them, making you change your character to appease them, trying to micromanage your time for you, etc.)
These are only a few. But they tend to be some of the bigger ones to watch out for.
