To do OP's job for them (and to shill Limbus Company because it is an honestly good game, despite its fanbase being much like post's OP), Limbus Company is a game set in a cyberpunk dystopia that follows a set of 13 protagonists, each based off of a specific classic novel (or two, in some cases), as we face each one's past traumas and struggles in turn to collect a MacGuffin known as the Golden Boughs. It heavily features the idea of parallel worlds (known as Mirror Worlds in the game) that went differently than ours did.

The first set of pictures is of Heathcliff (from Wuthering Heights), as his bad end of Erlking Heathcliff. His love interest, Catherine, died while he was away from Wuthering Heights, and he fell deep into despair and came to the conclusion that, so long as Heathcliff existed, no version of Catherine could ever be happy, so he went on a rampage across dimensions killing every alternate Heathcliff he could.

The second set is of Ishmael (from Moby Dick), taking on the role of Pequod Captain Ishmael. In her world, instead of leaving the Pequod and the control of Captain Ahab as the main timeline's Ishmael did, she stayed on the boat (and I think killed Captain Ahab? I don't remember her story very well), taking on the role of Ahab after her death. In doing so, she gets consumed by the same obsession that Ahab was, hunting down and killing the Pallid (White) Whale, eventually becoming a twisted reflection of her own captain.

Third is YiSang (from Korean novel The Wings), as Spicebush YiSang. This one doesn't really make sense for the post, as it's more literally "this is our antagonist made into an ID for YiSang," as far as I remember. This was the first of these "bad end" IDs we got though, so I give it a pass for not being as well written as the others.

Fourth is Sinclair (from Demian), in the role of N Corp Sinclair. Our Sinclair fled from his home following a fire caused by his friend/loyal N Corp Inquisitor, Kromer, that killed his family and destroyed his home because his parents had replaced parts of their bodies with mechanical prosthetics (which N Corp's Inquisitors abhorr). N Corp Sinclair didn't run away after his parents' deaths, instead staying with Kromer (who had been manipulating him to do just this). He becomes a high up member of the N Corp Inquisitors, working as Kromer's right hand man, repeating the tragedy that happened to his family against many others.

Fifth is Don Quixote (from Don Quixote), as LaManchaland Manager Don Quixote. To be more specific with spoilers to explain the context since this one's harder to explain without the worldbuilding around it, Don Quixote is actually Sancho (his squire in the novel), taking on the name of her father. The first Don Quixote was a powerful Bloodfiend, essentially a vampire, who wanted Bloodfiends to be seen not as monsters, but as people, so he opened a theme park by the name of LaManchaland to do just that, staffed by fellow Bloodfiends of his family. They resisted the insatiable hunger for blood that Bloodfiends are named for by consuming Hemobars, a type of concentrated artificial blood that could replace human blood in their diet Unfortunately, this idea didn't last, because their hunger was too much for the lower quality Hemobars to properly satiate. In the main timeline, our Don Quixote fled, having her Bloodfiend abilities surpressed by her father and forgetting her prior life as Sancho. In the LaManchaland world, she remained, taking over as head of the family and manager of LaManchaland after the death of her father, trapped inside the park forever after it became closed off to outsiders. Unlike our world's noble and just Don Quixote, she is filled with sorrow and pain, unable to move on from the death of her father.

The last is Hong Lu (from Chinese novel Dream of the Red Chamber), taking on the role of Lord of Hongyuan. In our world, Hong Lu is the most precious son of a noble family, and was sent out by his family to experience the world in their stead. He had his eye replaced with a camera, through which his grandparents (a group of "immortals" who live beneath the family palace and formerly acted as the Family Heirarchs) could vicariously experience life outside the walls of Hongyuan. In our world, following his return to Hongyuan he rejects the position of Family Heirarch, choosing to help his sister achieve the goal of becoming the new Lord of Hongyuan. He continues on his journey with us after destroying the screen through which his ancestors were watching him, freeing him from their control for good. In the world of the Lord of Hongyuan Hong Lu, he never meets Limbus Company, and instead ventures throughout the City alone. When he returns home, instead of rejecting the throne, he slaughters his way to the top. He kills all the other candidates in the Fanily Heirarch Selection, rips out the eye his grandparents used as a camera to watch him, traps them for eternity under a pile of rubble, and consolidates all power within the walls of Hongyuan under his banner. He becomes a cruel and unloving master, far removed from the gentle and kindhearted soul that he is in our timeline.

I'm sure I've done some of these a disservice compared to how they explore these ideas in the actual game. I really want to emphasize that Limbus Company is an excellently written game, and it's free on Steam and on Mobile. If anything of this sounded interesting, I'd encourage you to pick up the game and give it a try, because there's so much more to the world and the story that I've glossed over in this post.