This seems like it's turning into a spam topic. Let's not do that.
Lemme fix it by giving an experience of my own.
So, I'm the host of a Yu-Gi-Oh! RP on this site. I had this player, who I shall just name 'Player Y'. Player Y PM'd me to sign up to the RP, but had a few concerns. I'm like 'alright, I'll bite. Shoot.'
I discussed the issues they had, things went smoothly and then they pitched me the character. For anyone who's seen the original show, Player Y wanted to play a character sort of reminiscent of Kaiba, namely in the rich teenage asshole who somehow was the CEO of a multimillionare company, and had a little sister to keep him in line. They also had a backstory about a cursed card(YGO, just roll with it.) that lashed out against the audience in a tournament once, which was a burden on his heart.
This all? I actually was on board with it. Sounded cool, I liked the mechanical design of the card and it all seemed pretty solid. We go through the process of creating their character and deck, they hop on in and everything looked just peachy.
...Up until about five posts in.
Well, I should've been tipped off from the word salad that was their first post and rather... blatant copying of characteristics from the anime, but it's not like they were the worst I had. Naw, the problems started to occur when the asshole character suddenly decided to prevent someone from falling by jumping forward to catch them, doing a spin in mid-air and landing on his feet. That's some mad acrobatics right there, and it was all to prevent someone from getting tripped. The guy then proceeds to tell my character, who did the tripping by the by, off and saying they're a bad person. Just kinda shrugged it off, but then they headed over to an area that is specifically mentioned in the OP as off-limits.
Worst part is I allowed both those things to happen, and it didn't get any better from there.
A page or three further and we get to a moment where one of my players decided to have his character flirt with Player Y's sister character. Now, this sister character was a nice little cinnamon roll that wouldn't hurt a fly, aside from hitting someone with a paper fan if they acted out of line. None of this was really an issue, but it was her established character. Now, when the flirt did the flirting, this all got tossed out the window. She snapped at him, saying he doesn't understand anything about her or her pains (conversation had shifted to this, makes sense in context) and then still had the flirt escort her to her room. This would've been fine as a one-off snap, but this wasn't the case.
Sister character had turned into a nihilistic, unpleasant person who couldn't say even a single nice thing about the people around her. This was such a big 180° and came so far out of left field that almost half the players and me called Player Y out on it, but they justified by saying the nicety act was all a front and she was like this all along. Keep in mind she didn't mention any of this when pitching the character to me. Not only that, but she didn't even bother to have the sister character even *pretend* like she's nice anymore like what Player Y claims she's been doing.
From this point on Player Y shifted almost all, if not all of the focus from asshole to sister and had the character IC complain about every little thing and mistreat her cards, actively changing her favorite card into her least favorite card, yet still uses it in her deck. After about three incidents of this I said 'aight, the card's like totally not cool with this(said card was also the afformentioned cursed one) so it kinda refuses you until you treat it better'
Player throws a fit, insults me to hell and back, gets booted, PMs me still for like two weeks after and then goes silent until I get another PM a month later.
But that's a story for another time. This entire post is basically the TL;DR of it all, to get this thread back to it's original intention. g'bye.