At the end of Obsidian, the glass people break up their pieces, but the nudity isn't humanistic, more like transparent.

Marceline & Princess Bubblegum kissed.

Some violence, similar in tone to the show.

"Obsidian" features scenes of fantasy violence, including a city being destroyed, and a character coughing up blood.

"Together Again" features frequent punching and fighting, which results in giant bruises, referencing the first seasons of the original show. We also see skeletons from dead characters, a monster regenerating and showing its flesh and skull, and a kick in the crotch.

"Wizard City" has scenes where characters are killed. The main character releases frustration by headbutting the table or punching a mirror.

In short, the violence is the same but it can sometimes get more cruel. No blood is shown, but in the final 2 episodes the violence gets more cruel.

Occasional uses of "freaking", "flipping", "suck" and "boingloings" (as an euphemism for "balls") in the episode "Together Again".

The episode "Together Again" is specially intense because of its death themes and scenes of horror throughout. Other episodes also contain death references but milder in impact and frequency.

In "Wizard City" several characters die, one of them explodes off-screen and we see his skeleton and purple matter spread all over.

Some scenes in each episode, can leave a viewer frightened, shocked, terrified or even make them heartwed with included crying. In fact: Obsidian and Together Again, are some of the most inducing ones.