In a scene that shows Ashi's childhood, she is shown as a little girl only wearing a towel. Someone takes off her towel leaving her fully exposed. Her frontal nudity is visible but not detailed.

A random alien character in a scene has a head/face which resembles a penis and another character says as much.

Episode two has sexy alien dancers silhouette not raunchy though

Some women wear revealing outfits.

Josephine wears a slightly revealing dress.

One episode has underwear and a bra

There are some scenes where Jack is stripped to his underwear

Nothing over the top, but there can be some mild sexual innuendos.

In the episode "Jack in Wonderland" Jack goes skinny dipping, when the rabbit takes his clothes. Jack has to cover his nudity in the underground city by wearing many disguises while trying to find the rabbit who took his clothes. There are many instances where Jack's crotch region is only barely covered by incidental objects, such as leaves and puffs of smoke.

Very strong gory violence throughout the final season

Jack sometimes gets knocked unconscious while fighting

In "Jack and the traveling creatures", Jack is knocked unconscious and is nearly crushed by a giant rock that the guardian was using to take the final blow, however, nothing happens (A-okay!)

In one TV-Y7 episode, Jack is beaten up and a little implied blood is seen for the first time.

TV-14 violence type: blood and gore.

Large amounts of fantasy violence, but almost all of it is against robots. Jack himself is occasionally hurt, which sometimes leaves red scratches on his body. All violence is completely bloodless.

Because the show has adopted a more mature tone, Season 5 is significantly more violent. Violence against humans is common, and often comes with large splashes of blood which tend to linger both on the scenery and on the people involved.

Seasons 1-4 have no swearing whatsoever. Insults do not get any more profane than "stupid" or "idiotic".

Episode XCVII is the only episode in the entire series to ever contain any sort of vulgarity, with the expletives uttered throughout being "hell," "damn," "ass," "penis," and a "SOB" acronym respectively.

The Scotsman has a tendency to use Scotland-derived insults, including "schooner" and "cally-breek tattie."

A deleted scene for the episode "Tale of X9" contains the line "Damn feelings", but this line was left out in the final cut of the episode.

The Scotsman says that he has a daughter named Guinness(an Irish beer), but it's played for laughs due to them being Scottish.

Occasional drinking is shown on the screen, but it is never shown exactly what the drinks are.

(Deleted. Personal opinions about ratings are not appropriate for the Parents Guide.)

Some episodes are sad or frightening such as "Jack remembers the past" and "Jack and the Haunted House"

Show goes from being playful and happy to being dark and less child friendly.

Some episodes are more intense than others. Aku in particular can be an intimidating villain, and can be potentially frightening to children.

The fifth season is significantly darker, more intense, and more violent, being highly reminiscent to <a class="ipc-md-link ipc-md-link--entity" href="/title/tt3315342/?ref_=ttpg_gi">Logan (2017)</a>.