[mushroom32x]

Here is an adorable mod by kurobutt on Gamebanana that replaces Mario with Klonoa (in either the 1 or 2 outfit of your choosing). Not only does it replace Mario's model but also his voice clips and coins turn into appropriately colored dreamstones. I am having a blast replaying Mario 64 like this.  (Though you still have to deal with the game calling Klonoa Mario still lol.)
https://gamebanana.com/mods/364168

[rapappa the pepper]

If there is no ring, then there is no Klonoa. But, the models do look gudge.

[Thorp]

Amazing. That's all I have to say. Amazing.

[YukarinUniversalTraveler]

Hah, I remember seein' this one on Tumblr, and later on Twitter; so, it was a matter of time before I'd see it in here.

I loved the models, specially the DtP one, since its face looks like a Hello Kitty, and I love it.

[Cobra!]

I just discovered this mod, I want to play this on a real N64!