"He's taller than I am, but he's not as good a dresser," O'Hare hinted to TV Guide. "On hair terms, we're on par, neck and neck because I wear a wig, of course, but his hair is pretty rockin'. I think I still win on the hair thing.
"I have many fans, [there are] many people working for Russell."
O'Hare added that Russell's new lover is not necessarily the mystery person shown releasing him from his grave in a recent True Blood trailer.
It has been announced that Alfre Wood will also be returning to the show as Ruby Jean Reynolds, while Christopher Meloni and Spartacus actor Peter Mensah are among the new cast members.
True Blood season five premieres on HBO on June 10 and on FX in the UK later this year.