Random Talking Bush's Model Museum

[Random Talking Bush]

The Splatoon Callie and Marie models seem to be gray scale in their texture files, and will load as gray scale in Blender. Is this a mistake in the upload?

No, it's not a mistake. Splatoon uses a lot of in-game material colouring for things, using the "_TCL" textures. You'll have to either fiddle with the material settings (like I did for the renders), or edit the textures directly (by merging a coloured _TCL texture into the _ALB).