Hol up Ima actually try and help. Ok so by default the Jana Model is in the folder for MMODELS. You put JANA MMODELS/JANA.md3 3.0 0.0 in the models.dat in your SRB2 file. And it should work. Sorry if it doesn't.
Man I wish the Modern Sonic All Star was a thing. I mean I could just go into my models.dat file and change it to the current version.
Mods. That's how. Here's a link for Mario and some others. https://mb.srb2.org/addons/dirks-character-pack-r13.2149/
If you want Tikal to...
Jana and Skip look great! Even though Jana is unfinished, I can see why.
Sorry if I'm posting alot, I just wanted to show you guys how much I like these models.