How the songs fit the character?

Futakomori (Jigoku Shoujo OST)

I like the sense of mystery and sadness woven together in this melody. It's as if rumors are being passed around and the past is being revisited, even though no one could know the story but the Further herself. Someone who is known to traverse the lands of Eastern Europe, a being known to be powerful and dangerous but still heavily shrouded in mystery. 

(A distant and self-serving being. A woman who tests her own limits by challenging her subconscious not to disappear within its own darkness. Who is she? She's gone by different names, but they say her name is Aniela.)

Gravity Wall (Re;Creators OST)

A song that doesn't fit lyrically but one I imagine her to anyway. Usually duking it out with somebody. I like how it songs like fighting music, quick-paced and serious/dangerous-sounding. 

Sweet Sacrifice (Evanescence)

This is a song that relates more to Aniela's psyche back when she was younger and suffering feelings of revenge, contempt, and trauma-related pain from Russia oppressing her home country, Poland. Since it's a lot, you can find a deeper explanation here. 

Dark Darker Yet Darker (Slowed; Undertale OST remix by Crilyte)

A sense of intimidating, demonic aura, horrible and dark. Giving you the feeling that something BAD is coming, or already making its way through. A creature that should be avoided at all costs. A monster that can you rip you into two, devoring its live prey's flesh. A being that knows its power and smells and relishes in your fear. It smiles at you when passing by. It's not a friendly smile. Cannot be stopped. Cannot be stopped. Calculating and dangerous. Stay away.