First roleplay I ever joined was a bizarre Pokemon x Warriors crossover. Those Warriors novels, about cats defying their natural instincts by living in these little Clans that eventually jumped the shark by going full "GOD CLAN GAVE CHOSEN CATS INVULNERABILITY!" Needless to say, it was pretty... immature. The players spent the first six pages (of the IC, mind you) giggling with one another and then we they finally go to the RP-ing part, it was awfully confusing. Like, one Clan had a dojo in it? Also the names were nonsensical (Gastly do not have paws...!) and some characters contradicted the established laws of the universe...
Oh, but the first roleplay I ran was twice as bad. Actually, three times as shitty. It was downright abysmal; based around the Pokepark series, which is already a bad sign. There was a bunch of needless death and violence too. Like, the original Pikachu from the games was full-out executed by the main villain? I also shoehorned in a lot of things as we went, such as playing as one of the canon characters. Not to mention literally no one had any personality except one character that just spent all their time moping about and contemplating suicide. It was really bad, really rushed, and some of the players were downright unpleasant to play with anyhow. Glad I eventually locked it and replaced it with "better RPs" that died in a snap.