Complete Monster: The Entity is an ancient being from a group of celestials known as the Outsiders, who, after a war with the heroic Titans, was locked away inside an asteroid called Marduk. Stuck in Its prison, the Entity reached out with Its mind and influenced all of humanity with evil thoughts over the millions of years it has existed, and as such, is the root of nearly all evil throughout the course of human history. When the Entity gains a foothold onto the Earth by invading the mind of a man called "Nameless", the Entity forces him to massacre over a dozen people, then uses him to pull Itself closer to Earth over many years, slowly increasing Its influence over humanity and forcing them to commit more and more atrocities. When Nameless attempts to have the Entity purged from his mind, the Entity subjects both him and the exorcist to absolutely horrifying amounts of mental torture while turning most of humanity into ravenous killers who rape and kill anyone they come across. The Entity's master plan is to crash Marduk into the Earth, then open a dimensional gateway to allow the rest of Its species to enter this galaxy, at which point they will plunge what's left of humanity into a living Hell. Loving Its position as "God" of the galaxy, the Entity was described as a psychopathic and sadistic monster, and made no attempts to disprove those claims.
The Visual Novel:
Alternate Character Interpretation: Is Tei genuinely a kind person who wants to fill the Team Mom role he plays, or is all of his domesticity just an act to distract himself from his obsession with Eri? Yeonho and Lance's bad endings prove he will not hesitate to kill the other dolls if he feels he needs to, but there are moments that could imply an honest affection for them. His animosity for Yuri (which surfaces only after Yuri finds out how twisted Tei really is) may suggest otherwise.
Tei. He's responsible for at least one disturbing bad ending in EVERY route, his own route features four of the most horrifying bad endings in the game, he manipulates everyone around him (including Soi, who is honestly smitten with him but whom he only dates to distract himself from Eri), and he's deeply unstable and violent even on the way to his good ending. But he's pretty and makes delicious food, so naturally he's one of the more popular options.
Tei AND Yuri in Yuri's third bad ending, in which they decide to "share" Eri between them. It's obviously meant to be disturbing in-game, but there are plenty of fans who don't exactly object to the idea.
Yujin, the school nurse, both in-game and in the fandom. Obsessed with bones, deliberately creepy and off-putting, but again... he's really pretty.
The Wizard. As he was in Dandelion, he's morally ambiguous at best, and this game is much more potentially dangerous for the "heroine" than his previous one. But between his long hair, ornate outfit, Biseinen look, and cool Leitmotif, he gets plenty of admirers. His snarky interactions with Nameless/??? don't hurt his popularity, either.
Hollywood Homely: Eri considers herself to be plain and most people don't consider her beautiful, which is especially noticeable on Yuri's route, until she begins to use make up and is revealed to be Beautiful All Along. Actually, she's the cute type.
The shoes◊ that Yuri gives Eri on his route. They are either really cute or a strange color choice of pale pink with purple heels and a sparkly green bow on the side.
Tei's tan jacket and pants along with the purple button-up aren't too offensive on their own. Add what looks like a waist cincher, some kind of buckled leather(?) thing across his chest, and a bag that appears to be hanging from his belt down to his knee, and it's a fashion disaster.
Red appears to be wearing half a plaid shirt and a white t-shirt under his leather jacket, as well as another shirt or jacket tied around his waist. And a studded belt over that. Lance hates the entire ensemble.