#eros answer

Ramon- Sees the MC as Ariel's other father/mother/parent already once they're married. Ramon wants to give Ariel the best and hopes/knows you want the same. He would also like to raise more children with you but know the whole "demon promotion" process might turn off people that one day want to reincarnate. In that case there's always adoption/finding a surrogate demon to host or impregnate Ramon.... Ohh, by the way Angel/Demon (cis and/or trans) can get pregnant too! (See Irene's route for the explanation) Though I think Ramon is the type to encourage promotion so you two can be together forever.

Kalei- Kalei would absolutely love the idea of raising a child with the MC! His only worry is that every 5 years he, and potentially you, will need to go back to Haven Home for a year to help wayward souls get into Utopia. He would love your child but his passion to help trial-goers is also important to him so something will have to be figured out. Maybe having your child stay with his parents? He swears they're good people, they raised him after all! Similar to Ramon he would encourage angel promotion and even put a good word for you! but adoption/surrogacy is also an option.

Noel- I think Noel would love to raise a family with you... but a lot the things that plague him even after his story still haunt him. He would probably go far as to think he would be a terrible father and that you deserve to raise a family with someone that isn't disgraced like him. Plus there's the issue of needing to be promoted (preferably to angel but demon is possible as well) into order to conceive a child. And if that happened Limbo, even post-good end, isn't ideal for a child he thinks. So in the end he would reject the idea and would just want to enjoy Limbo with you for eternity or till you want to take the trials. I made myself sad lol.

Given humans can't have children in the after life... it's kind of hard to give their thoughts on raising a family the only option is to adopt or find surrogate parents? So I'll answer it with only those two options in mind for them.

DJ Roadkill- DJ wouldn't mind raising a kid but given they live in Limbo it's not the safest place yet. Plus finding angel or even demon surrogates is pretty close to impossible. So that dream will have to be at the backburner till Limbo is recognized as a livable third realm that allows demon and angel residents that can or abandon the idea completely.

Mitts- I think would be too busy with her work bringing Utopia to the modern era and beyond to want to raise a child. She's sorta just happy with having you and her many inventions that while she affectionately calls them your children are still just inventions meant to serve her/others.

Rosita- Rosita prefers being the fun aunt vs being the mom. She doesn't hate kids! She just can barely take care of herself and would rather invest her time in you.

Irene- She's a hard pass on kids. She loves Ariel but one is enough for her and similar to Rosita and Mitts is happy with just you.

... wow I just realized none of the female characters listed here want kids LMAO. Good for them. I neglect Cherubim and Faye from this on purpose as I can't discuss this without going into part 2 spoilers.