Beth Winter

I think 3 OCs is pushing it, but as long as you validate their existence in the plot it should read fine.

Be careful of the opposite of that: where an OC feels like it was created for the sole purpose of speaking one line or solving one plot knot.

If your fic is of reasonable length, you shouldn't encounter any of the above problems. I don't say write it well because I know how you write^_~