The kid from Pete's Dragon grew up to be some sort of Ninja Badass. Do you think he got teased by the other kids and Kung Fu taught him valuable life lessons and how to kick that blonde dude's ass in the Karate tournament after Mr. Miyagi magically heals his leg ... Damn, another Karate Kid fantasy. Sorry. Anyway, nah, he probably got teased by the other kids for other reasons. Yeah.
P.S.
1. Ninjas are mammals.
2. Ninjas fight ALL the time.
3. The purpose of the Ninja is to flip out and kill people.