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.
Demonic Spiders: A lot of the later enemies. The hammer and weapon wielders in the bonus levels are most notable.
Tin Men as well. Also, Cave Trolls.
Fan Nickname: A variation. Before the game was released, Brachyura was known as Blacula due to a fan's mistranslation.
This game gets the moniker of being the Metroid: Fusion of the series, due to the linearity.
Game Breaker: Nitesco combined with any weapon creates a giant sword that can hit nearly anything on the screen. Its light elemental makes it extremely strong against most enemies, and it gets stronger every time you use it. Add on the Death ring (or two), plus Dominus Agony, and you can destroy ANYTHING that doesn't absorb light or fire elemental attacks.
Quite a few other enemies, especially later in the game.
An early example being the Skull Spiders on Hard Mode (without the bonuses of NG+).
Harsher in Hindsight: During the tutorial, Barlowe says "So armed, you can wield Glyphs against your foes. Imagine I am one of them, and strike!" Guess what happens later in the game...
Les Yay: Two female villagers constantly flirt with Shanoa, and the Werebat enemy will joyfully exclaim "Let's play, cute little kitty!" every time one sees her. One of the female villagers, in particular, is all but explicitly in love with Shanoa. She even makes her a wedding dress.
Relationship Writing Fumble: Shanoa and Albus are supposed to be seen as Like Brother and Sister, but some of Albus' dialogue sounds more like what a lover would say. It doesn't help that we don't see much of Shanoa prior to her memory loss, which could've helped clear the confusion a bit.
Tear Jerker: The ending, where Shanoa smiles for Albus, who sacrifices his life.
That One Attack: Dracula's bat swarm in his second phase. It ignores Mercy Invincibility, it takes fairly precise positioning to avoid, and it can shred away your entire health bar almost before you can react. It only takes a few seconds of this to go from full health to Game Over.
Blackmore fills the screen with projectiles and attacks that will kill you in about 4 hits. Hope you're good at dodging.
Unless you equip Onyx accessories and use Nitesco.
Also, Eligor, a giant mecha centaur knight which you have to be very used to its patterns to beat easily, especially when you're on its back. Also, Gravedorcus gives you little room to dodge and is surprisingly durable.
Ruvas Forest, one of the game's "straight line from point A to point B" sections. On normal, it won't be too bad... on hard, with a level cap of 1, however, it will absolutely destroy you. Observe. You'll need a lot of jumping, a lot of health items, and a lot of luck.
The Woobie: Shanoa. She got manipulated into resurrecting Dracula by none other than the man who raised her, who also stole her memories and emotions.