A mixed bag. On one hand, the stories center on themes like self-confidence and teamwork, and the characters find that despite their individual limitations, they make a powerful adversary when they join forces. But on the other, stereotyping abounds (school bullies, outsiders, and popular kids), and there's a lot of potty humor, including vomiting (it's heard but not seen), burping, references to farting, and talk about pooping. Bullying takes different forms, from school pranks to threats of posting embarrassing photos to the Internet, but the instigators always get their due at the hands of the heroes.
Martial arts-style fighting both inside the dojo and out in the real world. Slapstick comedy implies that the characters suffer blows to the groin and other injuries, but nothing lasts. Collisions, crashes, and falls are obviously staged and mostly harmless.
Teens tease each other in a flirtatious way, and a boy pesters a girl about having a crush on him. In at least one scene, a character mentions being traumatized by finding out where babies come from.