A character claims Jonas has been to Jail in the past which Jonas denies. Whether this is true or not is never specified and the alleged reason for his imprisonment is never given.
Brief Hallucination of a main character being held underwater by a supernatural force and drowning. This is not real and this character is perfectly fine.
A main character seemingly jumps out of a window and dies upon hitting the ground but when you check where they landed, their body is now gone. You later see them fine. Whether this was because it was a hallucination or they survived because of the possession isn’t clear.
The previous death of the main character's brother is a major part of the story. It is not shown on screen, but is briefly described by the main character who witnessed it. Another character previously lost his mother which is brought up throughout the game.
People are teleported or possessed against their will by malevolent spirits but no traditional kidnapping onscreen. There’s a brief mention of an incident of a Mall Santa kidnapping kids in a casual conversation but no details are given and it’s only mentioned in passing.
If you take Jonas with you after the tower argument, some of the dialogue options you are given allow you to insult him for his Christian religious beliefs and call him stupid/brainwashed for believing it. This is an entirely optional dialogue choice that’s easily avoidable and inadvisable to begin with, since it will negatively effect your relationship with him.
Regardless of the ending you get with your friends, ultimately time loops back to right before the ferry trip, keeping Alex trapped in a repeating cycle and rendering their happy ending void.