In Hey Arnold!, Helga Geraldine Pataki is a 4th grader who can be bossy and a bit of a tomboy. She’s secretly in love with Arnold, but shows it by teasing him as little children do.
The McPoyles cross a new level of creepy. They always look greasy. They wear their pajamas in public and they’re obsessed with milk. If you’re into making people uncomfortable then their style is the way to go. However, you may want to steer clear of that whole incest thing. That’s a little too in character.