Fantastic Four
Keep:
Agatha Harkness
Annihilus
Blastaar
Devlor
Devos the Devestator
Doctor Doom
Dragon Man
Frankie Raye
Mr. Fantastic
Gorgon
Grey Gargoyal
Hatemonger
Human Torch
Huntara
Invisible Woman
Karnak
Lyja Lazerfist
Maximus the Mad
What can this guy do? Does he have any powers?
Medusa
Mole Man
I'm thinking we should just take him out. Seems wierd that he can just bring a bunch of ugly things, some even the size of buildings. If we take that away then he's just a short ugly man
Nathaniel Richards
Not sure on him yet.
Ox
Strong guy, anything else going for him? Does he have a chance at all?
Puppet Master
Psycho Man
I don't remember much on him but I remember him being powerful. Potentially too uber?
Ring Leader
I say take him out. He has a hyptno hat 
Ronan the Accuser
Super Skrull
Thing
Trapster
Wizard
Drop:
Blackbolt - too uber; he beat the snot out of Kid Omega, after all.
Diablo - Already on Avengers list
Franklin Richards - Either too uber or too weak, depending on version. His future version would be alright, though.
His future version is called Psi-Lord I believe
Kristoff Vernhard - Too little information, other than he's same as Doom. I say drop him.
Malice - Already discussed that she should probably be dropped.
Molecule Man - Too uber. (And, Forge shouldn't have been able to beat him last season!)
Vibraxas - Too little information about him.
He's been around quite a bit. He was in the Fantastic Force series, plus a regular guest star in the Fantastic Four at that time. He also showed up quite a bit in Priest's Black Panther series. He's basically a light version of Avalance I believe.
Potential:
Triton - Member of Inhumans. What can he do?
Mad Thinker What can he do?
Red Ghost (& his super apes?)