I suspect that you are rather like a Disney character to a lot of little kids. Larger than life, an aura that radiates "big kid" as well as resemblence in a vague way to several movie characters - clearly Hagrid is the most striking. They could also be thinking of you as any one of several "extras" off a Disney set. You radiate all of that good stuff and come across as sort of an oversized stuffed animal. Kids love BIG things, especially when they are non-threatening to them.

Use your powers for good :-)