Sort of, throughout the entire series the main characters are being watched and (SPOILER)
In Episode 10 or 11 a character is killed after one of the villains leaves a 'Cursed Object' in their home.
There are a multitude of bug-shaped monsters early on and just straight up actual bugs later on in the series. There are villains who fight using bugs and/or are bugs as well.
Montage scene of a character killing a large crowd of people with heads flying off, the character is seen holding some of the decapitated deformed heads afterwards
A character has the power to grotesquely deform people, and does this to three people’s heads. The act itself is very briefly shown, and the aftermath is shown a few times.
Nobara is affected by Mahito's ability, and just after telling Yuji her life wasn't all bad, her left eye explodes out of its socket. The POV is from behind her, and the eyeball is seen flying out of her head and onto the ground. The next episode shows a detailed look at an unconscious Nobara with her eye socket visible, and there is a POV shot inside her eye socket looking at Yuji in shock.
Out of the top of my head- One of the main characters' grandfather dies. He dies peacefully. The aftermath and when It happens are both shown.
In another instance, the mother of a minor character dies, brutally. The aftermath and cause are both shown.
I’ve seen some argue that Yuji/Sukuna is bad DID rep, but they are two completely different people being forced to share a body because Yuji ate a finger.
If I remember correctly, Yuji threatens it against Sukuna at some point during a fight. The main plot of the series is also about Yuji eating all of Sukuna's fingers so that he can be killed
SPOILERS****
Yuji has a panic attack after he transforms back into himself after sukuna fighting mahoraga and witnessing shibuya destroyed and people dead
s1e24 min05:09-05.32: it is narrated (without being shown) that a woman was forced to have abortions. images of the fetuses which are monster-like are shown.
(manga spoilers as of jan 2022, no s2 out yet) in the manga during the Shibuya arc, Mei Mei and her brother are characters that occasionally appear. the brother acts in a way that is uncomfortable, as the kind of admiration he has for his sister seems off. in chapter 133, the two characters are shown in bed together and there is an implication that something happened. they are not major characters and don’t appear often at all, however the author does not condemn this kind of relationship he wrote.
In Volume 0/The Jujutsu Kaisen movie, a little girl is killed by being hit by a car, I haven't seen the movie but it's shown sort of graphically in the manga. There is also mention later on of a drunk driver killing a child in a hit and run, not sure if these are the same hit and run or not, but they're mentioned in different instances.