With that many "TG"s in their abbreviation, I couldn't help myself. With one magical gender-change later, we have:
The Nostalgia Chick?!
The Nostalgia Guy
Dr. Insana. (Dr. Insano is actually Spoony's alter-ego, just now a girl. And none to happy about it. hehe)
This is rather in-jokey, as you have to know both their sayings and my own odd enjoyments to really get why this exists, but I thought I'd share it anyway.