In the most recent episode (ep 111), in a flashback from when he was a child,, Shigaraki's quirk accidentally activates as he is petting a dog, who dies graphically. It's pretty upsetting and they show the aftermath a couple of times before moving on from the scene.

No animal abuse occurs on screen. However, Nezu (a sentient mouse with a Quirk and the principal of the school) was reportedly experimented on in the past, and it caused him to develop a sadistic side (which we see during his fight with Mina and Denki).

One episode involves Present Mic getting assaulted by a group of bugs travelling from underground, and they end up covering his entire body. It's not extremely important, so skipping this particular scene is optional.

Although there is a character called Hound Dog which quirk makes him have the appearance of a rabid dog, he is pretty human and doesn't really fight other dogs.

(MANGA SPOILERS) As a child, Himiko Toga killed a bird due to her fascination with blood.

In Episode 111 a corgi is destroy by the childhood Tomura Shigaraki when he discovers his quirk.

There is a very minor character with snake hair.

Yes, in Heros: Rising the character Nine is able to conjure dragons that get killed.

Minetta is a pervert and doesn't exactly "stalk" anyone, but pretty close sometimes.

Todoroki was put through very harsh training as a child, and at one point his mother threw boiling water at him. This has affected him greatly, even as a teenager. Also worth noting: in the manga, a major villain (Overhaul) abuses a 6-year old girl while posing as her "father" figure.

Todoroki's abusive father tries to convince him that his mother, whom he drove to madness, was a bad person, and he's protecting him by sending her to the mental ward, even though he's the reason she went mad in the first place.

Between Todoroki's parents

Yes, and it is a centric theme in Vigilantes. In the main series there are villains addicted to smoking and alcohol but it is not a focus.

In season 4 and in the manga, a drug called "trigger" is produced. It's used to amplify people's powers.

Yes, a villain in a Yakuza group abuses alcohol.

When Bakugou gets kidnapped he is tied up with rope

No cutting themself, but the Hero Killer Stain uses knifes to cut other people quite a bit.

One of the villains uses his teeth as weapons. His name is Moonfish. They are used to fight and break like knives.

At one point in season 3, a child punches the protagonist in the genitals. I believe this is the only scene with anything of the sort.

In season 3, a villain named Moonfish is obsessed with consuming flesh, though he's never seen doing so onscreen.

The monster creatures known as Nomu have been burned to death but flame hero endeavor

Yes, the character Mr. Compress loses his arm on-screen and the character Tomura Shigaraki loses fingers.

Aizawa is pressed to the ground by a strong enemy holding his head down. He suffers injuries and is ultimately fine, but at the time there is the threat of head squashing.

One of the main characters frequently injuries his fingers, which are shown to be various shades of purple and bent out of shape, causing him pain.

Todoroki's eye is shown being burned by his mother

Yes, the character Re-Destro's lungs are injured by Edgeshot, Shemage attacks someone's lungs with fungal spores, and All For One pulls out one of Best Jeanist's lungs.

*Manga spoilers - Overhaul Arc* Overhaul uses his quirk numerous times on a young girl to "reassemble" her after depleting her body through using her quirk to develop a drug.

Midoriya Izuku is constantly breaking his bones due to his Quirk. It is a large plot point. Other characters are also frequently getting harmed.

In the manga a villain is dropped from the sky and falls too their death in a fight

Shigaraki’s sister is killed in the manga

Toya Setsuno was cheated on by his fiance.

Deku’s all might toy in ep. 1

A 5 year old boy named Kota lost his parents when they fought against a particularly strong villain.

It's a big plot point in season 3

There are elements of mind control, but no one is possessed per say

At one point, a character does see some sort of apparitions, but they're not really ghosts.

yeah, but i disagree w the person below vv they were pretty sexualized & the male (child) characters are shown to be like really flushed about it

endeavor exists

Bakugo vomits when he gets punched in the stomach by All Might during the Exams arc. It's definitely not depicted as sparkly rainbows that time, both in the anime and manga. Additionally a younger Todoroki and Shigaraki are seen vomiting in flashbacks.

only mineta, not the protagonist, contrary to previous comments. :/

There is an ongoing/common gag where Ochaco laughs and ends up spitting.

There is some audible bone cracking, and there are many screams of pain throughout the series. I'm not sure whether this counts, but as someone who finds it upsetting to hear people suffer, I thought it's worth mentioning.

Just because the show is about police and heroes doesn’t really automatically mean that it shows copaganda. Yes, it does show it in a way, but it also does show how corrupt some heroes can be. For example, Endeavour being the second best hero and abusing his wife/kids.

Himiko Toga uses a syringe while she fights.

Kaminari Denki does use his Quirk to electrocute people though

The protagonist is frequently sent to the hospital due to his tendency to break his own bones using his quirk.

Todoroki's mother is kept in the hospital by her abusive husband for mental reasons, but I believe it's a regular hospital, not a mental institution

Several characters’ quirks are dependent on their calorie intake and there are scenes showing them binge eating for that purpose. It’s not a mental health issue for those characters, but watching them eat like that could be triggering for certain people.

One of the main villains has a tic that results in him scratching his neck. The more upset he gets, the more he scratches. There are a couple shots that show red lines, depicting that he's hurt himself. Though not cutting in the usual way, I'd definitely still be wary.

No, but theres a scene in the first episode where the character Katsuki Bakugou tells the main character Izuku Midoriya to kill himself

One of the villains, Twice, has developed something akin to a split personality disorder due to a past trauma caused by his own quirk. He also has an emotional breakdown anytime his face isn’t covered by a mask and panics that he’s splitting in two.

y'all PLEASE. body dysmorphia and body horror are NOT the same thing

There are some scenes that greatly resemble anxiety attacks.

During the Yakuza ark one of the villains controls the ceiling, walls and floor of a building. I have personally felt this scene to be quite claustrophobic.

Theres a scene in the very first episode where the main character is told to "take a swan dive off the roof", other references of suicide have likely been mentioned throughout the series but i cannot cite them directly

Deku, episode 1. “One too many toe bones”

Occasionally used as first person POV to show a character looking around during a high tension scene.

Yes and no, because according to Japanese standards for anime, all strobe-like effects that have the potential to cause seizure already have a seizure filter over them.

yes and no, there is a character that tends 2 stare directly at the camera/viewers

There is a brief repeated detail of the first baby being born with a Quirk, but it doesn't show any actual childbirth, you just see the baby in the hospital

In the manga there is a group that is compared to the KKK and discriminates against people with mutant quirks.

As of now no black characters have died in the series.

As many people have said there is a villain character called Mange who is a trans woman. She and her friend who is also trans are shown to be overly dramatic, muscular, and hairy which are all harmful stereotypes. There is a leopard hero that wears dresses as a part of their uniform who also displays the same qualities. Almost all of the characters in the show except the villains misgender or explicitly point out their clothing. (The leopard hero gets the most comments regarding their choice in clothing since Mange is often seen in pants) Honestly as a trans person myself I feel like these characters are written in as jokes especially considering Mange gets graphically killed. This is a great show but it can be a little hard to watch at times so please keep this in mind beforehand and stay safe.

Quirkless people are heavily discriminated against by most of society.

A villain misgenders a trans female character, though her allies do correct the villain in question.

The character Magne, a trans women, is killed in a violent way. The villain Overhaul uses his quirk on her, which makes her explode in a bloody way.

there is a character whose quirk revolves around him being fat, but as far as i know no offensive jokes are made about him or his weight

Minoru Mineta regularly sexually harasses his female classmates-he makes inappropriate comments about them, tries to peep on them whenever possible, and has groped them more than once. Unsurprisingly, a LOT of people hate him, and what doesn't help is that it's played for laughs and he hasn't been expelled for his behavior (yet).

There are no actual sex scenes or anything like that, but I'm going to count fan-service as sexual content

In season 5 there is a flashback to Tomura Shigaraki's backstory where he is homeless and being ignored on the streets. He is found by All For One and taken in, though

Neither the anime nor the manga have finished airing yet.

No but if your worried about santa being spoiled maybe this show isn't for you, if your child is watching i feel like them believing in santa wont really muster the same innocence after this.

No, but during a filler episode in season five a plane with only two passengers (Uraraka and a passed out villain) almost crashes

Chapter 160 of the manga

MANGA SPOILERS /// 290 onwards In the manga Hawks prevents a near car crash although it doesn't crash it can be upsetting to see. In chapter 311 ? I wanna say All Might almost crashes his car but gets out in time before he crashes and then is attacked.

In season 3, the villain Mustard uses a gun against Kendou and Tetsutetsu

All Might coughs up blood often due to respiratory issues gained from a fight he was in.

There is a risk of drowning during the USJ arc of season 1, but nobody actually drowns.