Re Sass's potential chosen: I think we're on a similar page here, and your arguments are quite persuasive! Plus, that particular possible chosen might find a balance in the somewhat more easygoing Sass. For a given value of easygoing.

Re situations: Or if Hawkmoth otherwise harmed Paon Bleu's family, or came close to doing so, with or without powers in play. I can absolutely see Paon Bleu and Duusu stepping in then, perhaps more than once, without a flinch from either. And Hawkmoth may not be entirely without compassion, but there's little denying he's both capable of great cruelty and in possession of a quick, cold-burning temper. Make of that what you will.

My burgeoning headcanon of Paon Bleu as battered but unbroken night-flyer is getting aaaaaall the heck over these comments. Oops.