Oh man, I get a little carried away with characters sometimes, but Paisley Brickstone has 9 current "main" characters, but by the end will have had about 40. I wanted it a large class sizeworth cuz the school is based on the highschool I went to and we had pretty massive class sizes. I'm trying to spoonfeed things to the audience, though, so hopefully it'll be easy enough to keep track of. (I do purposely limit how many characters are hanging around at any given time, though, and a lot of time was put into trying to make sure each character looks different and recognizable.)
Perilous Journey only has 2 currently, and there will only be about 3 or 4 reoccurring side characters. It's also intentionally a much smaller story and even from the beginning I never planned it updating much longer than a year or two. (I'm currently sitting down and forcing myself to write the script in it's entirety just to force myself to keep it small as I can go off the rails if I'm not careful.)
I just launched 18 Saints are 18 Sinners yesterday and currently the plan is to keep everything centered around the 1 main character with about 50 currently planned reoccurring characters (this number may shrink as about 10 of them are super tentative and I'm trying to decide if their inclusion would mess up my plot structure). I don't normally write stories, especially long stories, about just 1 character, but I'm kinda going for one of those stories that's about someone who'd normally be a side character as he's not super involved in the main events going on in the background.
Now that I look over this again, these numbers aren't TOO bad as far as active characters go that are important for readers to remember. Some of my old stories I tried creating got a little ridiculous, so I think I'm learning B)