These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anti-Climax Boss: Given that most of the bosses are Puzzle Bosses, most of them become this once you know what to do. However, Riccardo takes the cake; it's possible to beat him in seconds, assuming you don't beat him up for items first.
Draco in Leather Pants: Daniella, Riccardo and Young Lorenzo often receive this treatment within the fandom. Never mind the fact all three are trying to harm, and potentially kill, a teenage girl who just lost her family and is being kept prisoner there. Likewise, some fans will invoke Ron the Death Eater on Fiona, or at least be petty and call her a whore and idiot while praising the villains.
Hewie could probably count, for being the main protection against the stalkers and in gameplay-wise, making the game original.
Fan Preferred Pairing: This game has no pairings, aside from the one-sidedadvances of Riccardo regarding Fiona, but you'd be surprised to find Daniella/Fiona is a very popular pairing within the fandom.
Seen for a second time, while she's wearing her "Under the Scalpel" costume, due to how short it is. This one's justified since Riccardo had stripped her down, while she was unconscious, so he could give her an ovulation test.
Good Bad Bugs: This video shows you how to trigger a glitch with the Golden Candlestick, which enables a series of other glitches. Such as making Lorenzo invisible, when he pursues Fiona, and also allows you to skip two of the boss battles against him, making it useful for speedruns (seen at 2:55). However, one of the doors, which you can usually open, will be locked while the glitch is active.
Lady of War: Daniella. A very elegant and feminine maid who isn't at all above assaulting people and dogs with glass shards or fire pokers.
Les Yay: Depending on whether Girl-on-Girl Is Hot or not, you might be more or less creeped out by Daniella groping Fiona in her sleep.
Moral Event Horizon: When Riccardo guns down Hewie in the forest, and uses him as bait for Fiona to come to his aid. If that wasn't when he what crossed it, then Riccardo raping Fiona in Ending D was what did it!
All in all, you could say that Fiona is a Deconstruction to the Purity Sue architype. After all, her Common Mary Sue Traits have served to be detrimental throughout the story, with the exception of befriending Hewie as without him, she would have never gotten out of the castle alive.
Squick: Lorenzo's voice. Those weird sucking noises!
Or how about the fact that Riccardo is Fiona's uncle who looks exactly like her father and is making it his mission in the game to rape and impregnate her?
That One Boss: Every boss in the game has to be defeated in a specific manner and it's easy if you know what you're doing. But if you want to get items before you defeat them, things get difficult. But the best example (and the only one which doesn't involve getting items off the boss) is the last chase with Lorenzo's burning corpse and the damn statue! The part is so hard that the players believe the statue is the real final boss.
The Woobie: Fiona. The poor girl looks like she's going to cry in most cutscenes she's in involving the stalkers. Doesn't help that her parents were killed by a man who not only looks like her father, but intends to rape her and the castle that could kill her with death traps turns out to be hers!
Possibly Daniella as well. Riccardo interrogates her about Lorenzo, she's hinted to have been sexually abused, and expresses discontent at being an Artificial Human. Is it any wonder she goes insane? Though trying to kill Fiona out of jealousy and Hewie, whether or not he gets in the way makes Daniella more of a Jerkass Woobie.
Debilitas too, considering he doesn't really know what he's doing is wrong.
Hewie! You'll want to kill Riccardo for shooting the poor pooch and leaving him to die in the forest.