Apart from the turtles, Shredder, April and Casey....
 

...What were your favorite characters?

Old Toon

Krang
Bebop
Rocksteady
The Fly
Don Tertelli
Rat King

Anime Series

Kinzo

The Next Mutation

Dragon Lord
Vam Mi
Chi Chu
Bing
Silver
Silver's henchmen
Bonesteel
Wick

2003

Hun
The Monster Hunter
Baxter Stockman
The Purple Dragons
Utroms
Silver Sentry
Malignus

bebop
dark mu
couldnt sat about nm
hun

Krang
Bebop
Rocksteady
Rat King
Slash
Karai
Hun
Leatherhead
Zog
Mortu

Old Toon

Rat King
Baxter-Fly
Slash

Anime

Dark Mu (kinda hot)

Next Mutation

HAHAHAHA! Nobody gives a sh*t.

2003

Haven't really been any new characters to catch my attention yet. Quary and the underground mutants were kinda cool, though.

Can't forget about Splinter. In my opinion, he kept the old toon kind of in tune with reality, so to speak, as the turtles got into so many quirky and random predicaments. I loved his words of wisdom and teachings, and it was hilarious when he would cut loose.

Ok now im confused in who most of those characters are, well some of them too, im surprised to not see ***** in there ^_^ Anywyas um i guess ill go with the fly, isnt he the guy Donnie mostly takes on? Right then if he is then i like him cause Donnie always kicks his @$$

neutral :|

slash

old

Krang
Bebop
Rocksteady
Slash
Rat King
Baxter/Baxter Fly
Usagi Yojimbo

new

Utroms
Leatherhead
Karai