Characters from the past that have shown up on Nick's TMNT
 

Aside from the main cast of TMNT/Splinter/Casey/April, here is the cast list of old characters revived:

Shredder
Karai
The Foot
Foot-bots
Baxter Stockman
Mousers
Rat King
Leatherhead
Metalhead
Rahzar
Slash
Mutagen Man
Chrome Dome
Traag
The Kraang (evil version of the Utroms)
Kraang Prime (based on THE Krang)


Oddly enough virtually all the major TMNT villains have shown up this series except for the classic Bebop/Rocksteady and the Triceratons. I don't know if we'll see 4kids characters like Hun and Bishop but it may be possible.

So....The Turtles, Splinter, and April are main cast...but the Freakin' Shredder isn't? (Foot is kinda a essential too.)

Not gonna let that one go, eh?

Well yeah.

I didn't include Wingnut because I don't think Kirby is him, plus the toy is simply called, "Kirby-bat" so it was likely a joke.

Kraang Prime is as much based on Krang as Kirby is based on Wingnut. They're just two different characters.

Was this topic purposely done to rub the Chrome Dome thing into my face?

Wingnut was a throwaway gag and Don told Mike off it, plus the toy isn't called "Wingnut."

Kraang Prime lived in the Technodrome and had an Android body like OT Krang's.

Well the character WAS called Chrome Dome, not, "Bradford robot."

For all we know, the Technodrome is one of her many bases and not the one it 'lived in'. That little tuning fork was a small homage, but that robot looked nothing like the OT Krang robot. The character didn't act anything like Krang. ANYTHING.

I'm still calling it Bradford-bot. Or NotChrome Dome.

And what if Kirbybat was a pre-release name or whatever and toy does come out calling it Wingnut? What then genius?

How do you measure the size of the homage? To me, that tuning fork was this show's message to vintage fans to say, "this is 'the' Krang" at least as far as this show is interested in pursuing the concept.

It's even conceivable that KP could appear later with a recurring role, essentially playing the part of Krang, but without quite the same slapstick approach from the 80s. As the updates in this show go, the Kraang Prime vs Krang update is consistent enough with the many other re-imagined characters for me to think of it as "THE Kraang".

This seems likely to me. If the final figure isn't explicitly called Wingnut by release, I would be surprised if it wasn't at least addressed as his "official" nickname on his cardback bio. Just like with Kraang Prime, I'm thoroughly satisfied that Kirby is this show's version of Wingnut. I don't anticipate that we'll later have a "true" or "Huanu-ian" Wingnut.

Kirby bat is wingnut, way more than kraang prime being kraang. They explicitly call him wingnut, now regardless of if they no longer call him that, or that he's completely different than the old character, he is this versions wingnut.
Kraang prime isn't krang. It has not been confirmed at all to be that.

Just because you don't want Kirby bat to be wingnut and want kraang prime to be krang does not mean that that is how it is.

Completely untrue. When Mikey called him Wingnut it was a gag to old fans, since Donnie said, "We're not giving April's dad a monster name!"

Secondly the toy is called, "Kirby-bat" and not Wingnut. This is not intended to be Wingnut, whether or not the character actually shows up or not.

Kraang Prime is far closer to Krang than for him not to be. He's an updated version of the same character, just like Rahzar, Mutagen Man, Slash etc. all have different origins than past incarnations.

You forgot Traag.

Spider Bytez, Casey Jones, Tang Shen

If KirbyBat's Wingnut, Rat King is Verminator X.

I think Kirby Bat will eventually become Wingnut, but we have one more advancement of his mutation to go before we get there.

Um, Shredder is part of the main cast since he's the main villain. You might want to fix your list there, Cubed.

Spider Bytez has little in common with the very obscure 2K3 character, if that's the case Metalhead's been around since the comic.

I'd wager Spider Bytez is just a coincidence.