These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Wrathia being a Rules Lawyer in order to get out of keeping her end of the deal.
Maggie as well. She was willing to kill Ava and Odin because the later refused to apologize to her for kidnapping her even though his actions saved her life. She's even angry when she discovers they survived the crash and then she tries to convince Gil into sending Ava and Odin to the authorities. In all fairness, she had no reason to believe Odin wasn't lying and had in fact kidnapped her (and she did wake up to another girl bound and gagged right next to her, which doesn't really help his case). Although it doesn't excuse her willingness to let Ava die with him.
Gil. Watching your home planet be ravaged by Silent Scavengers and dying from horrific injuries will do that to you.
Oh, dear God Ava. Having a demon who has constantly tried to kill her and caused her to have zero friends, as well as hints of suicidal depression from Ava? It's a miracle she's even alive.
Before he became a demon, Tuls was a guard serving a Princess that he fell in love with. His side of the pact involves seeing her one final time and finally confessing his feelings. Even if that means he will be rejected. Being the demon of Maggie certainly adds to the woobie factor as well.