Yes! Bring back Doakes. When they killed him off in season 2 (I believe it is season 2) I was in tears, he is so awesome.
I almost wanted Dexter to let him go from the cage and Doakes just let everything go, but I knew Doakes wouldn't let Dexter off the hook, then he exploded anyway.
And as we're on the topic of bringing people back, bring back the Trinity Killer's daughter, she is fiiiiiiiiiiiiiiiiiiiiiiine.