There is a girl who wears revealing clothes showing her stomach.

There are some mild sexual innuendos.

Sometimes there is kissing and references to you know what but nothing that wouldn't go over a kid's head.

One character is shown in a port-a-potty reading what seems to be a plebowl (possibly a pun/inuendo of playboy) magazine but since this is a kids show, the magazine is not graphic and the man has no visible genitalia.

A crossdressing old man uses apis (the show's equivalent of apples) as fake breasts which fall out in one scene.

Some female characters wear skin tight clothing but it's nothing too suggestive since this is a kids show.

Two young girls are shown taking a bath. They are both completely nude but their breasts and genitals are conveniently covered by steam and a rubber duck.

In season 3, a pandawa (anthropormophic panda-like species) gets asked about balls, but it's later revealed the character asking him is referring to marbles instead.

In season 3, episode 7. The antagonist of the episode is revealed to be a collector of underwear with copious amounts displayed on his walls and wants all the main character(s) underwear except for a young girl character's.

A lot of kisses and romantic relationships, also the girls' clothes are indecent.

Frequent bloodless, fantasy, and slapstick violence throughout the series. Nothing too graphic.

A boy accidentally burns his tofu (fictional bird-like species)'s rear end while trying to use his powers. Nothing graphic but they take this scene rather seriously.

A boy repeatedly bashes his head against a gigantic shushu (fictional demon species) presumably made out of stone, while there's no blood, his face does get pretty bruised up in a comedic fashion.

Bloodless Scrathes, Purple Eye, Hurts Part From Body.

Uses of Shut up, Suck, Stupid, Idiot, jerk, brat, and 3+ uses of hell (referring to the place rather than used as an exclaimation). Mostly childish insults not too out of place in a PG-rated show or movie.

Ruel sticks up the pinky finger as an alternative to the middle one in one episode.

One character calls a story "drunken".

Like, what one reference to beer or something? There are cups ( I can't remember the name) That look like they are for beer, but the show does not show anything.

Occasionally some characters die, which may be sad/emotional for some viewers.

The tone of the series becomes darker over the seasons.