People who act all excited to RP with you, make a character and then, as soon as you write the starter, they'll pretend to be excited but then ghost you. You see them active everywhere else save for the RP you started and, when you ask them about it, they just keep ghosting you. There's also people who lie about checking out the fandom you're into in exchange for checking out a fandom they're into and, after writing the starter, they give this confession about not only not checking out what you asked them when you are checking out what they want you to check out, they give this whole sob story playing the victim and get mad when you show no sympathy. I made a deal with someone once to check out My Hero Academia if they checked out Go Go Loser Ranger and then, after saying they fulfilled their part of the deal and making me write the starter, they gave me this whole sob story about how they haven't checked out Go Go Loser Ranger and had no intent to and whined about being a terrible RP partner. Needless to say they didn't get any sympathy from me.