Hey Arnold was my favorite when I was a kid. I was 5 or 6 years old when I first watched it. It was my first "big kids" show, (before I first watched Nicktoons, I only saw PBS Kids stuff) and I just fell in love with it! It'll always have a special place in my heart. Anyhow. Arnold is a very positive role model. He is a nice person, a good friend, and he always tries to help people he knows, friends, family members, etc., even though sometimes he would end up getting into trouble himself. Usually characters wold learn a moral lesson. Some episodes would also feature urban myths, (such as the episode The Headless Cabbie), but obviously they would turn out to be false, but either way, some kids might get a little scared or nervous of those sort of episodes, (not that I was scared when I was little XD). The main character Helga has a huge obsessive crush on Arnold, but she never shown it to anyone she knows, she always makes fun of Arnold in public, calling him names like FootBall Head, or HairBoy and stuff. I should warn that in a few episodes Helga has said the words "crap" or "crapola" but I don't remember specificly hearing them when I was a kid, I just saw when I watched the episodes on DVD. If you do hear it, just tell your kids not to say it because it's not nice. Helga has had a bad home life, her parents ignore her. The never said if out loud, but there has been suggestions of her mother being an alcholic (depressed, always falling asleep in random places, slurred talking, bad driving record), but again, I don't think younger kids would reconize such things until they're way older. I think it's a great, funny, interesting, old school, down to earth cartoon that kids will love.