Traits

The classic, round mouse ears.
They should be mostly circular and not oval-shaped. Maximum size of a single ear is ~the size of their head, and minimum size is ~1/3 the size of their head.

Ears that are squashed and flat on the inner side, while curved on the outer side.
Maximum size of a single ear is ~1/2 the size of their head.

Small, pointed ears that look like triangles.
Maximum size of a single ear is ~1/2 the size of their head.

Very long, tall ears.

Large ears set lower on the sides of the head instead of the top.

A pair of flowing, ethereal ears. Shape is undefined.