Mutants
 

What mutants from the OT have not appeared in the Nick cartoon yet?

Far too many to list. What's the point?

Aside from Tokka, Groundchuck and Dirtbag, not many unless you count the Havoc mutants.

So many to choose from. Mona Lisa is one, There hasn't been a female mutant on the show since... Karai, Who recently turned into a mutant Snake.

Muckman and Joe Eyeball, Merdude, Ray (Fred Wolf's version of Man-Ray), Mondo Gecko, to name a few.

Well, Mondo Gecko has been confirmed for Season 3.

https://pbs.twimg.com/media/Btfi5PxIIAAdTlw.jpg

Muckman as well it seems

-Bugman
-Alopex
-Al Falqa
-Tokka
-Ace Duck
-Armaggon
-Bloodsucker
-Dirtbag
-Doctor El
-Groundchuck
-Halfcourt
-Ruff the ref
-Hot Spot
-Koya
-Monty Moose
-Bob the beaver
-Perril Grey
-Sandstorm
-Scrag
-Scratch
-Jail Bird
-Sergeant Bananas
-Larry the Lemur
-Hallocat
-Nevermore the Scarecrow
-Nocturno the Owl
-Verminator-X
-Walkabout
-Kid Kangie
-Wyrm
-Mona Lisa
-Dreadmon
-Jagwar
-Ray Fillet
-Wingnut
-Screwloose
-Flamming Carrot

Did I miss someone?

Flaming Carrot is a completely human crossover character, and most of these are very obscure.

You missed:

Ninjara
Venus Di Milo
Lobster Surprise
Quarry
Stonebiter
Razorfist
Sonic the Hedgehog (and company)
Katmandu
Pai-Doth Noor
King Nail
The Dark Turtles

I'm sure you did, and most of those aren't OT mutants.

The OT didn't have many mutants. Tokka, Groundchuck and Dirtbag are the only big ones yet to be used.

Silver from Next Mutation...despite being a yeti technically, he was far too human to not have been mutated. Also, Scum-Bug.

Out of who you listed I'd like to see:

-Alopex - 3rd choice
-Tokka
-Ace Duck
-Armaggon (Newtralizer reminds me of Armaggon a lot)
-Verminator-X - 2nd choice
-Dreadmon
-Jagwar
-Ray Fillet - 1st Choice
-Wingnut
-Screwloose