She was actually ripped from crash Nitro Cart. Its the same model that I used to make that Blender Coco game a while back
The model itself did NOT come with a rig though but up till now ive been doing all of my rigging and weight painting from scratch anyway. So I just took her and added bones then the model was ready to go
My favorite thing so far is building an IK rig (they use these in MMD) in which case a person can just grab a limb of the character and move it around freely. I used various methods from different people in the past and then finally combined a few of them to develop my own variation. Unfortunately this Coco didn't have an IK rig at the time I animated her because I simply didn't know how to make one back then. If she did I could have done the animation a lot differently with her or moved the character in an even more realistic way.