How do I create a 3D Avatar for Mixamo?

Does anyone know how to Create a character on this website to use for the animations on Mixamo?

You have to model it in a 3D program. Mixamo is merely a glorified auto-rigging tool, but the actual meshes need to be created elsewhere if you don't use their stock presets. that being the case, it's utterly pointless to even sign up for CC just because of this - if you were to model your character say in Blender, you'd also animate it there. Sorry to say so, but you fundamentally don't seem to understand how 3D workflows work and are simply looking in the wrong place. Your needs are served better literally everywhere else, just not Adobe, who have a track record of getting everything wrong that even remotely has to do with 3D. They simply don't understand this stuff.

Mylenium