I decided to give Urho some wheels:
Urho has been approved as Super Tux Kart add-on which you can download in-game to take his Stingray for a spin. Two of the current default mascots turned out to not be free culture (Hexley and Beastie) so I’m hoping Urho and/or Toots will qualify.
Beautiful
The attached license is
Urho and his Stingray kart by Frode 魔大农 Lindeijer
License: CC-BY-SA
Texture license: CC0
Just to be sure , Can I use it in my Urho.Net Demo samples ?
They grow up so fast. 
Yes.
Both are work-in-progress, btw: Urho is not animated beyond steering yet, and the back of Toots’ kart is still somewhat open/undetermined.
Now I understand where you got your idea
Well, STK did already have Puffy.
So I didn’t introduce the concept of a driving fish to STK. But maybe that’s where the researchers got the idea from. 
Urho controls his kart using a handle that fits his tail.
Glory to the King