When you get done with opening the gate to enter the Castle grounds proper, Dracula appears to taunt you. If you pay attention, he says: "All who oppose the Dark Lord must die." Just another example of Drac being larger than life, speaking in the third person, right? He doesn't call himself Dracula because he's not. In reality, this is Gilles de Rais, Dracula's servant charged with guarding Dracula's dormant spirit. You must achieve the conditions for the Best ending to face the True Dracula... And if you don't get the good ending, you never realize that Dracula was under your nose all along.
After Reinhardt prevents Rosa from committing suicide, and doesn't aquiesce with her wish to be slain, Rosa complains that he's not attacking her because she's a female, and then proceeds to question if he'd be willing to attack a female or a child... which she then comments "Then how will you face Lord Dracula?". She wasn't questioning his ability as a vampire hunter, she was outright Foreshadowing what Dracula was masquerading around as: the child Malus!
You only see Rosa once as Carrie. Considering she attempts Suicide by Sunlight in her second meeting with Reinhardt, it makes you wonder if she succeeded.
Since Reinhardt isn't part of the main Belmont bloodline, considering what happened to John Morris, the Vampire Killer may have consumed his soul sometime after the events of the game.
A common misconception, but Reinhardt IS, in fact, part of the Belmont bloodline. The in-game prologue describes him as such and says "his blood dooms him to oppose the might of Count Dracula. Wielding the holy whip of his ancestors, the young vampire killer begins his quest". He simply comes from a line with a deviating surname, which implies he is a Belmont through a female ancestor and not a male. In fact, his surname is stated as a cause of angst for him in his backstory: As a child his friends would mock him and doubt his lineage and this led to a bit of self-doubt in his part. Thankfully, this would mean Reinhardt likely had long and normal life, probably next to Rosa, if what the good ending suggests is anything to go by.
Which is carried by the Fanon that it was Reinhardt who gave the Vampire Killer to John when World War I started and Countess Bartley made her attempt to resurrect Dracula.
The fate of the the poor, poor Heinrich Meyer. Who's that you ask? Why, the friendly blue Lizard Man who tells you about the Mandragora+Magical Nitro combo that you need to advance in the game. He was a human merchant who thought it was a good idea to try to make business at the castle and was transformed. After you leave the Castle Center and later the castle's destruction at the game's ending, there is no further mention of him. Was he crushed under the rubble? And if he did survive, was he condemned to spend the rest of his days as a monster?
