[X] The Prison Within Himself
[X] Prideful Hellfire Prince:
[X] Spiteful Acid Mother:
[X] Thousandfold Reflections Prince:
[X] Envious Silvered Heart:
Tesaki's good enough at violence already that we might as well pick what seems thematically appropriate. Malfeas is obvious - Tesaki is a small angry bundle of violence and stress, trapped in an infuriating situation with (previously) no escape. There's a lot of parallels. For the other Yozi, however, I would argue that Szoreny fits Tesaki better than Kimbery does. Kimbery is all about hiding cruelty and ugliness beneath a veneer of beauty and kindness, socially or in combat. She also has a strong emphasis on blood ties and family above all else, regardless of the healthiness of that relationship (it's worth noting that in her Beloved/Reviled mechanic, only the Infernal's intimacies matter - and Reviled trumps Beloved). Tesaki's not a big family guy. He wants one, sure, but in the decades he's been with the Vashra, he's managed a significant positive intimacy with exactly two (2) people. Szoreny, on the other hand... Envy, spite, deception, these are all things Tesaki holds near and dear to his shriveled little heart. Also, Tesaki's just had his "family", such as they are, cast him out. He wants that family and the benefits associated with it - but doesn't belong, knows he doesn't belong, and envies them that belonging as much as he hates them for imprisoning him outside the family.
tldr; Tesaki is angry and jealous, & so should be Malfeas/Szoreny.
Although I can't shake the feeling that we're going to say something very unfortunate to Masumi with Indelible Toxic Truths.