In the storage area you hear many flashbacks where a little girl is fleeing from her pursuer. That would be Daniel after going over the edge. Her dialogue is mostly screaming at her attacker to leave her be, but one sad line sticks out. "Please let me go! I won't tell anyone, I swear! I just want to go home..."
Daniel's confession is a very emotional moment from the game too. He is so filled with anger, regret and sorrow that he can't stop thinking of all the horrible things he had done, and cannot stop crying, he resorts on drinking the amnesia potion to save his sanity.
Alois' Undying Loyalty to Justine tends to envoke sympathy from many fans. It's helped by the fact if he kills Justine, he says "Hush now... It's all right..." After everything she did, he still loves and forgives her.
All of the Suitors' conditions. They are tortured horribly just to be used in Justine's sick games. Except maybe Basile.
While Alexander did horrible things, it's heartbreaking when he begs Daniel not knock down pillars because he's THIS close to getting home and to his love.
Alexander: I'm just like you, Daniel. A prisoner of circumstance. Trapped in a world I no longer recognise. As you gain your freedom, will you deny me mine? We are so close now. Closer than I've been for centuries.
And even if you let Alexander win, it turns out in Amnesia Rebirth that his homeworld is already destroyed by the Shadow. So in the end, he has nothing left.
Alexander's theme/ending music is quite melancholic, especially the alternative version.
Custom stories:
Believe it or not, Amnesia has one with the Valentine's Day custom story A Visit to Katherine. There are no monsters, no sanity to deal with, just you having to find recordings of your character's wife after waking up in the bedroom. As you play, you learn that your wife has fallen seriously ill and that you have some form of anterograde amnesia (you can't form new memories meaning your mind resets every day) AND retrograde amnesia so you can't remember your past either. Once you find last recording, when your wife says goodbye after reminding you of the day they met and the anniversaries they had, you enter the garden. And the last thing you see in the game is your wife's grave. Coupled with top-notch voice acting, this is a narrative to get the waterworks flowing.
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