Mule's degree of deformity

[Gugudada]

Hellos!

I have questions about the Mule’s looks:
How obvious should a Mule’s deformity be: Quasimodo or cleft lip?

Would almost everyone ID the mule as such? How (I bet there can be other deformed peeps out there)?

Thanks
GGDD

[Thor]

http://en.wikipedia.org/wiki/Mule_(Foundation)