How to Train Your Dragon - Image #621,064

The Neville Longbottom principle:

Sexiness of dweeby character = (x-1) / m

Where x = the sequel number (with the first in a series being 1),
and where m = the umber of times removed the character is from the protagonist (so the protagonist would be 1, the most important supporting character is 2, and so on).

Neville Longbottomed sounds dirty.