I also tend to have tiny casts, at least when I first start. Right now in my novel I have a murder victim, my MC, her love interest, her ex, her uncle, and a cat. Plus a minor ensemble of assorted police and one clueless youth pastor. And that's rather large for me.
My other WIP started out with three characters, expanded to four, then stayed that way for years and years. Now I think I'm up to seven.