Who are your top 5-10 characters, that you want to see in a live action movie...
 

...That haven't appeared in a live action tmnt movie, yet?

Mine are:

Rat King
Leatherhead
Metalhead
Slash
Tattoo
Pizza Face {the chef, not the living pizza blob}
Irma
Mondo Gecko
Mousers
Roadkill Rodneys

We've had this thread many times already, bud...

TMNT characters that haven't ever appeared in a live action TMNT movie yet?

Well, let's see...

1. Leonardo
2. Donatello
3. Michelangelo
4. Raphael
5. April O'Neil
6. Casey Jones
7. Oroku Saki
8. Karai
9. Leatherhead
10. Renet

You snippy little cookie, you! You beat me to it! <Should be read in the voice of Ray Gilette>

Replace Renet with Splinter and that'd be my list.

The 1990 movie was live action.

Yeah I'm cool with this answer.

There's not much further south in can go, so they might as well have fun with it. Platinum Dunes versions of...

Ace Duck
Muckman
FOR THE LOVE OF GOD Mousers
Usagi Yojimbo
Mondo Gecko
the Neutrinos
the Triceratons... actually, I want PD go full wacko and have the TMNT go to the Triceraton planet and have it be a nutty, Bay version of DINORIDERS. Laser-equipped dinos, spaceships, the works.

Pretty much all 7 of the original Mighty Mutanimals as they appeared in Archie Comics!

Baxter Stockman
Mousers
Leatherhead
Rat King
Slash

1. Karai in an actual role
2. Rat King
3. Slash
4. Hun
5. Foot Elite

1. General Traag
2. General Traag
3. General Traag
4. General Traag
5. General Traag

1. Tiger Claw
2. Usagi
3. Tang Shen
4. Fugitoid
5. Slash and Leatherhead depend on what versions we're talking about

1. Usage Yojimbo
2. Fly Baxter
3. Slash
4. Leatherhead
5. Shredder's Mom

There's a good chance that Fly Baxter will be in the next movie.

I'D LIKE A NEW MOVIE FOCUSING ON;

1.) Rat King
2.) Leatherhead
3.) Slash

As the bad guys, and;

4.) Lotus Blossom
5.) Carter (human form martial artist, not mutated)

As allies. Bring a little diversity to the human friends, and give April and Casey a rest for a flick.

how so?

-----)-

5. Renet
4. Fly Baxter
3. The Neutrinos
2. Rat King
1. Slash

Yet to appear? 1. Rat King 2.Slash 3. Leatherhead 4. Agent Bishop (if Krang is follow up on) 5. Punk Frogs

1. Leatherhead
2. Old Hob
3. Angel (friend of Casey's as April has Vern as her side of things)
4. Agent Bishop
5. Nobody (as the police know about the Turtles now)
6. Hun (not aligned with the Foot, has personal vendetta against Casey for some reason)
7. Tatsu (third in command of the Foot after Shredder and Karai)
8. Triceratrons
9. Neutrinos (IDW versions preferred) or Fugitoid
10. Mondo Gecko

Bishop
The Utroms
Renet
Leatherhead
Hun (the IDW or 2k3 version)

1. Agent Bishop
2. Hun
3. Usagi
4. Rat King
5. Leatherhead