Well, she is a hybrid of human and monster, with the monster bit being sourced from what was left of Asriel/Chara after they went to the surface. So, she'd probably just abosrb souls, using them to augment her powers like a monster would.
Name: Alexandria "Alpha" D'Angelo
Age: 20
Motivation: Wants to see whoever put her here dead, preferably by her own hand.
Fatal Trigger(s): Being threatened with experimentation, losing her journal (with all of its secrets)
World Origin: Undertale/OC (bite me)
Powers/Abilities...
Name: Alexandria "Alpha" D'Angelo
Fandom: Undertale (OC)
Affiliation: Unaffiliated. Alpha was used long ago, by something too similar to the Taskforce. She'll never willingly make that mistake, ever again.
Gender: Female
Age: 19
Race: Boss Monster/Human Hybrid
Appearance: White fur, horns...