Rule of Cute
No other words can describe this.

If it's adorable enough, then it doesn't have to make sense.

For example, anatomically improbable creatures can be perfectly justified in the right setting.

Subtrope of Rule of Cool. Compare Rule of Glamorous, Tiny Tropes.

Contrast Gonk, Hollywood Homely (where someone isn't supposed to be cute or beautiful, but is), Informed Attractiveness (where someone is supposed to cute or beautiful, but isn't more than anyone else).

Tropes running on this rule include: