Mkay, here we go.
(spoilers, although I guess none of you care)
- Both exhibit a girly-girl facade. (at the beginning, of course. they're both insane as hell behind closed doors.)
- Both are highly manipulative. You mentioned that Ani will find great pleasure in taking advantage of Allie's mental issues. Betty (as she is more commonly referred to as) does something similar, just with a very immature character instead.
- Both are relatively young, but with no shortage of power.
- Both are commanded by a higher power or entity (Nemesis Core in Ani's case, Agate Lightvale in Bete's).
- Both have an association with the color pink (vaguely, in Ani's case, I noticed the presence of violet in her color scheme).
- Both have insane regenerative abilities.
- Both have superhuman strength and senses.
- From what is implied, Ani is an enhanced human, so neither are (entirely) human (though they both appear and function like one). One is (from what I can gather) genetically enhanced, and one is a spell created to ensure two races would never live in peace.
- Both have a possession that is much more powerful than it appears. (Technically, if we're counting live entities. Bete's possession is Kumu, the other half of her soul. Ani has the parasol.)
- Both have business in taking others' abilities (Bete in the form of taking the SOULs of monsters and humans, Ani in the form of the "extractions"). Both tend to kill their victims as well.