I tend to make several whenever possible, mainly because I like the diversity in the cast and I'm not stuck doing one thing at a time in an RP full of different things going on at once. It also tends to keep the RP interesting for me, when I have multiple different perspectives on a single world. Such as, there was one RP where everyone was trapped in an abandoned school. There was the one character who saw it as hell, another who saw it has his own personal paradise without rules, and another who wanted to take it all over.

However, when I'm running my own RPs, I tend to make many characters, 10+ actually. One RP I'm doing off site I have 14 characters in total