In the scenes near the end of episode 89 the scene shows an adolescent version of Tiff which may be too suggestive for children however the scenes where she was shown running and sitting in roses are removed from the dub because of the massive size of her breasts which may be unsuitable for American audiences

Mild public display of affection between couples.

Lots of fantasy violence between Kirby and all the monsters.

In a deleted scene in episode 2 Kirby is seen firing a rifle repeatedly almost killing the rest of the characters who ducked and covered the scene ends with the police station collapsing

In episode 5 King Dedede threatens to cut down Whispy Woods with a chainsaw in the English dub the chainsaw was replaced with a laser chainsaw mostly to make the episode more kid-friendly.

Kirby has the ability inhale his (non-human) opponents to mimic their (magical) attacks.

A lot of explosions.

The English dub has no actual swearing while the original Japanese version uses damn,bastard,hell and pissed off these were used in the original versions of episodes 3,5,16,17,19,26,44,46,55,57,60,61,65,66 and 67

Mild insults.

In some scenes removed from the English dub that show Samo working at his bar also in episode 13 Curio begins to smoke a pipe but was interrupted almost letting him drop the pipe

In the episode Un-Reality TV, a character mentions steroids.

In a flashback scene removed from the English dub of episode 12 King Dedede is seen chasing Escargoon with a clown costume and a chainsaw this flashback scene was removed from the English dub because this was too violent or it would frighten younger children

Some "jump scares" might scare younger kids.

Some of the monsters look pretty menacing.

A robot dog (who grows attached to Kirby) self-destructs after King Dedede tries to steal him. Kirby mourns its passing. This could also be emotional to some viewers between a young age and their teen years.

Some scenes where characters appear to be dead, but are later revived.