I believe the most intricate plot won't matter much to readers if they don't care about the characters, especially in a series. So I try to focus hard on making each character, whether villain or hero, have an interesting flaw that readers can relate to.
“I like directors who come on the set and create something that's a little dangerous, difficult or unusual.”
“I wish I could sing. I love singers, but I am way too shy. Scares the hell out of me.”