Random thing, but between the boys who want to have children in the future who do you think are more open to have adopted children?
The question just came to me when randomly the thought "wait, what if Yuu doesn't want to get pregnant in the future?" came to mind
Ideally, none of them would mind. If it's what you want, then they are more than happy to provide! If we wanted to be a bit more realistic, there are a few where adopting might be an issue.
(I had to go through my brain again to remember who I think wouldn't have kids cause I couldn't find my post, but Leona, Ace, Jamil, and Idia wouldn't want kids so they aren't here. I can't remember if I had more or not on the list)
Kalim and Malleus are the first two where it would be an issue. Quite frankly, the people around them wouldn't allow it. The Asim family gives me the vibe of those who prioritize blood relations as family (if the 30+ kids didn't help with that already). Unless the kid was adopted as an infant and looked very similar to you or Kalim so that plausible deniability was possible, they couldn't risk it. Kalim is often dealing with death threats and assassination attempts just so the next member of the family can be the heir, if extended family were to find out that your kids (and thus next heir) wasn't blood related to Kalim, then there could probably be some legal issues with inheritance. Malleus, similarly, is under a tight leash with the Briar Valley's council that Lilia has been struggling to remove. I haven't seen much of Chp 7 so I'm working with very limited information mind you, but from what I can tell they are very traditional and extremely concerned with maintaining the Draconia (and the draconian part) bloodline strong. I feel that adoption to them would be out of the question with no hesitation. Neither of them I think would feel very strongly against it though: Kalim would see it as an opportunity to grow your happy family and Malleus I think would actually strongly relate, as he himself is an orphan. He'd see it as an opportunity to take after Lilia and give the love and care to a child that more than deserves it. If they really are set with adoption with you, then Malleus would have no trouble setting his foot down, he is the rightful ruler of Briar Valley and if he says that's his kid and heir, then that's his motherfucking kid bitch! Kalim I think would require that he's not only grown a sturdy backbone as an adult, but also a very ironclad will and testament. But it's not impossible, just very very difficult.
The next ones that would have some concerns about it would be Riddle, Sebek, and Ruggie. Riddle's case is a bit similar to Kalim's but not really. It's more so whether is family (specifically his mother) would accept his child being adopted. I think the fear of his kid being alienated from the family would be a lot for him, and I can't really gauge if I this Mrs. Rosehearts would be opposed to it or not, as well as whether Riddle remains in contact with her as an adult and still values her opinion as well. I think it would depend on the circumstances, sadly enough: if you were unable to have biological kids for whatever reason or if you could but would be extremely risk on your health, as a doctor I think she would understand. Sebek though I think would struggle internally a lot, he's not opposed to the idea of adoption at all, but he's so attached to his family name and his fae blood. I think knowing that he has a child that might not be accepted as a true Zigvolt for not being blood related (and potentially a human) would eat him up. He already had to deal with that himself (externally and internally, I'm not sure). But he's also been around Lilia a lot, and I think some positive reinforcement and encouragement from him would help a lot. Ruggie is very simple, adoption is so fucking expensive, man. That's a lot of fucking money, so he's willing to wait as long as needed to save up.
The rest of the cast I think wouldn't have any qualms about it, as there's no history or trauma that I think would affect their decision. I think Trey, Deuce, Azul, Jade, Jack, Rook, and Silver are the most eager to have a family, while Cater, Vil, Epel and Lila are okay not having any if you don't want any either. I think Floyd would greatly depend, as much as I love him, massive mood swings are not great for raising children so he'd need a lot of maturing to do, if he even wants kids (he keeps changing his mind about it, some days he's in love with the idea, other days he's pretty indifferent) but he wouldn't mind having kids with you. Silver would obviously love the idea, he's had a great experience and father, he'd want to pass that experience along to his own kid. So if adopting is an option, then why not! If it's what you want (and they think raising a baby with you is something they'd like to do) then who are they to oppose? They'll love that kid from the moment their eyes meet, as much as they love you!