Relationships are a part of the human characters' mundane struggles.

Occasional kiss scenes.

The third rule of trollhunting is "when in doubt, go for the gronk-nuks." This is implied to mean hitting an opponent in the genitalia.

Goblins explode into slime when killed, which is quite graphic.

Changelings explode into dust when they die.

The second rule of trollhunting is "always finish the fight" meaning kill your opponent. However, Jim sees the flaws of this rule.

A high school kid says: "You broke my tooth. I'm gonna break your life. When I'm through with you, you're gonna wish you were dead".

In part 3 there's very mild blood in two nose bleeds and a cut on the cheek if small amount of blood dripping from it.

Creatures get turned to stone. It is implied that they die. At one point, a character turns to stone and is destroyed.

Many fights with swords, fists, and other medieval weapons.

A few chases on bikes or in cars.

Two characters set up traps involving arrows, spears, and hammers in anticipation for a particular enemy.

Death is referenced and presented as a threat from time to time, in a PG manner.

Some of the violence is played for comedy.

Toby's fat-shaming jokes are mostly self-deprecating but not always, some are directed at him by others, and it seems to be all that this character contributes to most of the script

When Toby is not joking about his size or mentioning counting calories, dieting, losing weight, etc he's often pretty creepy/desperate around female characters including the Jim's own mom.

Trolls drink an unidentified liquid from mugs occasionally. It is implied to be alcoholic.

In season 2 a cat is been eaten by white goblins. This is off screen, but it is pretty clear what is happening, and it can be a little creepy for small children.

One character is an orphan who lives with his grandmother.

Gunmar turns troll into Gumm-Gumms in a process implied to be permanent. Jim is sometimes forced to kill these converted trolls to protect those that remain.

Sometimes it looks like a human is going to die but then a troll sacrifices themself to save the human.

Occasional scenes where Jim is expected to kill an opponent but doesn't.

There is a lot of fighting and action.

Some of the main enemies may be frightening to younger viewers, as well as some of the trolls. Morgana and Gunmar may be especially scary.

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

The characters are subjected to peril in almost every episode, in a PG manner.