Yeah, she seems to be having the most fun playing her character. Especially in the little intro songs in her Fight Club show ^^If I take Seiyuus into consideration yeah probably. Eli would be my number one in this case.
But the biggest surprise has to be Honoka. I love her Seiyuu and how she acts.
Her overall goofiness is just too adorable. ^^
Mimorin is still best seiyuu though.