Any characters that appear to be underage are never depicted in a sexual manner.
The worst case is the Cat unit Twinstars, who is primarily obtained by rolling on the Cyber Academy Galaxy Gals banner when it's available in the Rare Cat Capsule. They wear dresses that are short enough for their underwear to show when they attack.
All Uber Rare Cats exclusive to the Galaxy Gals banner could be interpreted as minors since some of their unit descriptions mention things like detention and a principal, which are typically found at high schools.
Three Cat units reference BDSM: Dom Cat, Bondage Cat, and Vacation Queen.
Dom Cat's evolved form and true form do not reference BDSM at all.
Bondage Cat's descriptions for his normal, evolved, and true form all mention how he enjoys pain.
Vacation Queen is a variant of Dom Cat, but only looks like Dom Cat in her normal form. In her evolved and true form, she appears as an office worker. Her evolved form does attack with a whip though.
The true form of Ancient Egg: N104 throws scalpels to attack. Unlocking this unit's true form is not worth it, as the unit is severely outclassed in its Floating crowd control and anti-Behemoth niches.
Iron Cage Pegasa's normal form description states that she is frail. She is always seen sitting in a massive floating chair, which further implies some kind of illness. She is obtained from the Cyber Academy Galaxy Gals banner.
The Cat unit Vacation Queen uses a shark to attack in her normal form.
There is an enemy that resembles a shark called Dolphina. Although she's a cartoon dolphin, her mouth is full of sharp teeth. These are only shown when she attacks.
There is an enemy trait called Aku. Enemies with this trait have a devilish, demonic, or generally evil appearance.
There is also an entire story chapter known as the Aku Realms, where the Cat Army traverses through the titular realm. This location is full of Aku enemies. This story chapter is also mandatory, as the player cannot progress
past the 38th subchapter of Uncanny Legends without completing the Aku Realms.
Certain unit descriptions (mainly anti-Aku units) mention the unit making a pact with the Aku in exchange for power or knowledge. The end credits for the Aku Realms also mentions Aku pacts.
There are two horse enemies (Angelic Sleipnir and Infernal Pegasus Deonil) that the player's Cats can encounter and defeat.
The Uber Rare Cat Date Masamune rides on a horse. If he is defeated, so is his steed.
The player can encounter and defeat cartoon moth, ant, and bee enemies.
The Summer Break Cats event also revolves around bugs. The player can use Legend Nets to obtain event units based on beetles and fireflies. Event stages and event enigma stages play audio of cicadas and other various bugs making noise.
There are three ghost enemies (Ecto Doge, Ecto Snache, and Ecto Baa Baa) who primarily appear in non-mandatory Event Stages, most notably the August event stage "Ghostly Houseguests" and the seasonal June Bride stages.
The Zombie enemy Inumusha is controlled by a Doge spirit. His Cat unit counterpart, Miyamoku Musashi, is controlled by a Cat spirit.
The Cat unit Ancient Egg: N203's True Form is Clown Cat. It attacks by suddenly extending its neck forward and biting the enemy. This unit can only be obtained from the June Bride of the Devil event.
It's an incredibly bad unit that isn't worth using.
The Cat unit Wheel Cat attacks by spitting a projectile at the ground.
The enemy Tackey and its variants Hackey and Ackey attack by firing a projectile from their mouths, which could be interpreted as spitting.
The unit Baby Cat, its evolved form, and its true form all feature infant Cats.
The advent boss Doremi dresses up like a baby, most notably sporting a diaper. However, her enemy description states that she has "over 7 years of experience in infancy", so she is likely not an actual baby.
Users cannot interact with other users in-game, nor can they set a name for their account in-game. However, users can give their Cat lineups custom names, including slurs and other forms of hate speech.