This game features branching timelines. The dog dies onscreen in only one of them, though in another it is implied that the dog will die very soon after the end of what is shown in that timeline.
While he doesn’t become a domestic abuser, Eric, who was heavily abused by his father during childhood, is one of the most violent characters in the game, very quickly losing his temper and becomes murderous at several points, even having no qualms with killing a child.
Eric talks about his family history with other characters, including how his father became very abusive to him and his brother after the death of his wife, to the point of beating Eric’s brother to death.
Diana to alcohol as mentioned above. Sigma has to stop her by smashing the bottle on the floor and physically restrain her from licking it off the floor.
There’s a pretty disturbing where Diana heavily abuses alcohol as a coping mechanism and has a complete mental breakdown. She starts crying, begs Sigma to have sex with her just so she can feel some happiness, claims that he hates her when he says no, then begs him to kill her, which he also refuses to do. There’s also a scene where Junpei gets drunk but it’s more upbeat and nowhere near as bleak as the Diana scene.
It only occurs once though and the woman is suicidal and drunk in the moment. The woman also slaps the man in the previous sequence so it's used in the same "stop it, snap out of it" way.
It is shown on the cover. There is a puzzle involving someone being restrained to a chair. Depending on the player's choice, that player can potentially die in that chair. After the puzzle, the restraints release and the character can leave.
No explicit sexual assault occurs on-screen, but rape is mentioned in a character's backstory, and one character acts as though he is going to assault another character to create a diversion. Two characters have sex when one is sober and it is ambiguous whether or not the other is sober or drunk; the scene is intended to be taken as consensual.
Carlos acts like he’s about to rape Akane at one point. In reality, this is secretly a way to distract Zero while he tells her about his plan to escape the facility. You aren’t given this context until several minutes after the scene and it’s pretty convincing initially that Carlos had genuine intent so this may be triggering.
The burning alive is not shown graphically in the slightest. One is shown in a flashback. The other time involves someone who has basically willingly sacrificed themself for the sake of another person. Their body is literally reduced to ash, so there is nothing to see, but a personal belonging of that character is found in the ashes.
A character gets caught in an explosion, losing both of their arms. You do not see any gore due to the clothes they are wearing, but you do see blood on the bandages applied to said character.
One scene has a character rooting inside a corpse's chest with the intent to rip out its heart. The noises during the scene are very graphic, but there's subtitles so even if the audio is muted you won't miss any important dialogue during the scene.
Not many, but in a few flashbacks there's the surroundings of a hospital shown as a still image. A few characters are mentioned to be hospitalized, but they aren't shown actually in the hospital.
One bad ending has a character commit suicide after killing another, and another has a a character commit suicide believing he had killed another (but was mistaken).
Other comment is a bit spoilery but the short answer is yes, multiple characters do in many endings and this is shown on screen. In a few instances it's unsuccessful and these characters will not die like this every time, but many of these timelines are required to finish the game
Very briefly, you hear some crying noises from babies after a childbirth scene. It is a very short sound bite that repeats like 3-4 times in a row and then never plays again. As someone who finds this particularly distressing, the sound wasn't that bad.
(HUGE SPOILER): It is revealed that the player was basically a tenth participant and also the mastermind. This illusion is broken once the truth is fully revealed.
A woman gives birth to twins. You see them asleep as the mother and father name them. The scene does not last for too long, but it is an incredibly plot-relevant scene which is brought up later.
The explanation a character gives for why they became a serial killer amounts to a misunderstanding brought on by them exhibiting autistic-coded traits. Another character believed to be a blind and deaf wheelchair-user is revealed to have been lying so that they would be underestimated.
Sort of? A character that’s mentally much older than he physically appears gets in a romantic and intimate relationship with a woman in her 20s in one time line.
There are some files unlocked in the "Cinema" section of the game after finishing it. Other than that, no, unless you count the credits rolling after every ending. But as far as after the true ending, it's just those files.
At one point you are given a timer and a giant red button and told not to press it during the time limit. The game is trying to trick you here - If you do press it, the entire facility is destroyed in a nuclear explosion