Sorry if these have been mentioned.

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When you see an rp that sounds interesting, but the person tells you which photo to use for your character profile and they tell you every detail of how they want your character's personality and background to be. Might as well be playing a fandom character at that point.

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Interest checks that only say a few lines, for example: "Hey anyone want to do a [blank] role play? Hit me up!" Sometimes their thread title sounds good and then you get nothing!

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Not being flexible and only RPing one gender, especially in romance role plays.

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A character is supper submissive and will not have an opinion or do anything.

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Looking for a IRL male to play a male character or IRL female to play female character. I've seen some good sounding RPs, but they only wanted a IRL male because they were looking for a male partner for their character.

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Getting a RP request, but it sounds like cybering, bordering on creepy. [This has happened more on other forums, but a couple on here, too.]