Occasional form-fitting/somewhat revealing outfits.

Mild flirting.

A female villain refers to a male villain as "beef cake." He later says, "You're a feisty little girl, aren't you?"

A villain flirts with a hero and winks at her, saying "You know you love us."

Mild cartoon violence and fight sequences throughout the show.

The main hero attacks a villain while he's down, it's later revealed that this was an illusion.

One of the antagonists frequently assaults his teammates and attempts to eliminate the main heroes on multiple occasions.

On multiple occasions, characters are buried alive under rocks and left for dead, they are always rescued though.

Season two is a bit darker than the first season and the fights are more high stakes.

A villain is kidnapped by three other villains who use their powers to put him to sleep. He is later abandoned at an isolated location but unharmed.

Occasional name-calling, mostly by antagonists.

Words like "darn", "dang", and "heck" are used, albeit very rarely.

None.

Certain attacks cause hallucinations/narcotic effects.

Back stories of characters can be emotional at times.

The main character's father was nearly killed by a villain.

The main villain kidnaps the parents of three villains off-screen, this may be upsetting.

Enslaved characters in episode 1, this might upset some viewers.

Certain monsters could be scary to younger viewers.

The main antagonist is a towering, enigmatic man who may frighten younger viewers.

The second season introduces the Hiverax, a trio of cyborg brothers. They are brutal and creepy, and often try to eliminate the main heroes as well as they're own allies.

Season two introduces "shadow kairu" which causes monsters to mutate.

Two characters are nearly killed in an explosion caused by one of them attempting to use a forbidden technique.