Right, thanks and sorry for all the trouble. I was mainly bothered because I've been in a lot of stuff before where because no one had to be screened characters wound up getting involved then having incredibly dark and gruesome backstories that clashed with the tone of the RP or backstories that contradicted the story and made things messy. Or it just turned out that multiple characters had personalities so completely opposite of one or more party members that it became impossible for them to work together without derailing the RP.

Plus, if you as the GM have access to characters backstories and personalities and they're any good, you can use them as plot hooks to set up cool arcs or recurring things or manipulate the characters in cool or even devious ways since you know how they're supposed to act.