Oh crap, if you wrote Jimmy Neutron in the first place, that would have made a bit more sense :/ So here's a redo!
1. When was he vegetarian? See last post. 2. Idk, they seem less dysfunctional than friends in OTHER shows. It just doesn't help that Jimmy is a bit smarter than them. 3. Apparently many people believe characters who hate each other are secretly in love. Or that some characters who show aggression to a character do so because they either can't express their feelings to them or are embarrassed to. For the most part they seem to dislike each other, but meh, it shows up in an episode or two. 4. Same as last posts, kid heroes appeal better than adult heroes and there always has to be villains after them for some reason or other. 5. Again, plot holes and it only comes up when it's convenient.
TL;DR, Basically same as last time, but I only found out they were referring to Jimmy Neutron and not Johnny Test.
Learning to use proper grammar would help a lot. Plus, most of your post plain makes no sense. Not to mention, Johnny's not even the smart one, he relies on his sisters for that. 1. When was Johnny a vegetarian? Even then, what's wrong with it as long as they don't bash on people who eat meat? 2. Maybe they just have an odd perception of friendship? He mostly only talks to his sisters anyway, I don't know if he even has real friends outside his family and his dog. 3. Maybe in a couple episodes, but from what I can tell, he hates her. 4. Kids' shows tend to do that. Especially in older shows where kids are the main characters, because kids can relate to a kid or teen hero better than an adult hero. 5. Magic? It's a cartoon, it's not supposed to make sense and is often rife with plot holes. How do his sisters get plutonium and all their stuff?
TL;DR, yes, I do know way too much about cartoons I barely even watch :/