Again, it can be almost anything you want to be within reason. The disposition stuff should be thought as a stereotype, generalization, or outline for the Mamono.
Personal headcannon for the Hellhound: For her husband at least, she's basically the one in charge in the relationship, but she wouldn't be against cooking her husband a meal.
She'll also "demand" belly rubs and ear scratches.
Thanks good to know I'd love to give a hellhound belly rubs it would be adorable ;)
The more domestic and subservient mamano would be your best choice. Ones like the Kikimora, Inari, shirohebi, kobold, holstaur, Apsara, mermaid, Yeti, and sea bishop.
Pretty much what Aura said. As a rule, Mamono conform to their husband's tastes, though like you stated Hellhounds and Manticores lean towards the S&M side. But even then, their number one priority is their husband's happiness, so they'll do whatever they can to make him happy.
For gentle fendom, I would say:
-Lamia.
-Wurm.
-Wyvern.
-Dragon (dominant; becomes submissive if the husband is stronger...).
-Arachne.
-Nereid.
-Kraken.
-Scylla.
-Mershark.
-Giant Ant.
-Honey Bee.
-Black Harpy.
-Harpy in heat.
-Werewolf.
-Anubis.
-Grizzly in heat.
-Large Mouse.
-Devil Bug.
-Queen Slime.
...and others...
All of those capture their husbands, rape them and keep then prisioners until subverting their will, but none of then torture, beat, hurt or humilliate their man...
The Wyvern sounds fun you can ride her while you ride her also I really like the werewolf but the whole pack side is a let down.Â
Galeah, I'm going to have to disagree with some on your list. I would not call the lamia, scylla, or wurm gentle. They're more demanding of affection than they are submissive.
The Scylla and maybe the Lamia could work, but I don't really see the Wurm. She's usually a little airheaded for that.