Admin Mawile: (・o・) I debated a lot on how to answer this clearly, so you get headcanons and a most to least list!
Most to Least compliant/easy to dom:
Azusa
Laito
Shuu
Kou
Kanato
Carla
Yuuma
Ruki
Reiji
Subaru
Ayato
Shin
Headcanons:
Shuu:
-It’s not so much that he’s willing to submit as it is that he just doesn’t care. He does everything possible to put up a facade of lethargy to hide behind, and doesn’t bother to fight back against any of your advances. It’s too much trouble to struggle, and he’s not willing to even try.
Reiji:
-He should be smart enough not to fight back, especially since his mind is rather unstable, but his pride won’t allow him to just give in. He’s dignified to the very ending, doing everything possible to seem unafraid… that is, right up until the moments when he finally crumples.
Ayato:
-He’s bratty and nasty, seemingly doing everything possible to get on your bad side. It’s as if he has no sense of self preservation, and seemingly fails to realize that fighting back just earns him more pain. He’ll break eventually, but it’s a long road of struggles and bad attitude.
Kanato:
-He’ll whine, complain, and throw horrible fits, but the second you try to punish him, he’s a sobbing wreck. He’s nowhere near brave enough to even try to stand up to you, and the slightest violence drives him to tears. It’s almost worryingly easy to completely break him.
Laito:
-Out of self preservation, he pretends to enjoy what you do to him, hoping that it will somehow earn your favor. He’s also one of the ones with the easiest to access masochistic streak, and before long, his pretending has turned into genuine enjoyment of your kind of treatment.
Subaru:
-He struggles horribly, determined not to give into you so easily. He’s used to being able to defend himself with his strength, and constantly forgets that his power will do nothing to you. He’s easy to tease, mentally, but his strong body makes him a hard one to physically damage.
Ruki:
-His pride demands that he do something to avoid giving in to your intimidation, but common sense demands that he not do anything to make you want to hurt him. He winds up more submissive than not, too afraid of what would happen to him if he doesn’t at least pretend to do what you want.
Kou:
-He talks big, but falls apart the second things get violent, horrible memories yanked up to the surface in an instant. He’s far from loyal, but he’ll crumple under your will on the outside, too afraid of what will happen to him if he doesn’t at least pretend to go along with what you want.
Yuuma:
-He knows enough not to do much to fight back, but isn’t content just taking what you do to him, either. He walks a fine line between defying you and bringing on more pain, and does whatever he can to fight back without getting hurt for it. He doesn’t care struggle once you get serious.
Azusa:
-He adores being pushed around, and will come back begging for more every time. He loves every second of your control, and longs for your bites and punishments as much as most of them long to get away. There is absolutely no question that he’s beyond willing to submit.
Carla:
-He has an absolutely monstrous ego, but is smart enough to know that fighting back will get him nowhere. His illness not only makes him weak, it makes struggling too much dangerous, and he’s compliant partially out of the fear of worsening his symptoms or risking his health.
Shin:
-He viciously fights back to the very end, pushing himself far beyond what any reasonable person would. His pride won’t allow him to give in to you in the slightest, and he’ll keep trying to fight back unless you absolutely break him, even though he knows inside that struggling is useless.