>>717473932
No, but 4 has a feature that lets you register any 2 characters as lovers for no reason.
D3 extra stories and D4 have some "shippable" main chars.

>>717474165
Ideally, yeah. New ones are born at 1/10 of parents' average level (max potential level, meaning they'll be lower until maxed), and if they're born subdued, it means they stay there.