I decided to make my response it's own post cuz reblogging the ask post would've made it too long and what I have to say will likely be too long for a reply.
So, @gothgeek1997, to address some of what you've said here/asked:
'Braver' isn't exactly the word I would use for him, though he's definitely the son Adam would've wanted given the Bible's description of him being 'born in Adam's likeness'. That supposedly means he was like Adam in regards to his devotion to God, but...not sure how well that really applies to this version of Adam. But in terms of 'bravery', I don't think that'd be super accurate. He's arrogant and that arrogance could be interpreted as bravery, but I don't imagine he'd necessarily be on the front lines were trouble to come calling and, unlike Adam, I do not see him being the type of person who'd get his hands dirty. (That's what Lute's for.)
In regards to his relationship with Cain and Abel, I don't see Seth caring about either of them. Why would he? He didn't know either of them in life, so he wouldn't have the nostalgia of growing up with his older brothers to give him any fond feelings. There's just zero family connection there because both Cain and Abel were long gone by the time he was born and would've any understanding of their connection. My view of Seth is that he's incredibly conceited and believes himself to be superior to pretty much everyone and that includes the brothers he was born to be a replacement for.
As I mentioned in my response to your ask, I don't see him being outwardly mean or cruel. In fact, I imagine he'd come across to most people as being very affable. It's what he says and how he says it. An example that immediately pops to mind would be in regards to Abel's position as head of the Exorcists. Specifically how Seth would comment about how Abel shouldn't be in that position. Using phrases that might sound well-meaning, but in actuality are insulting like, 'It's okay, we all know you're just not cut out for this', or 'Surely you'd be happier playing with your little lambs than wasting your time playing commander'. Just being condescending and shitty while presenting himself as kind. I think, by present day, Abel's just kinda used to it and so he doesn't respond to it anymore, even if some of the mean shit Seth says still hurts.
My Cain would fucking hate him. Not at first, granted. At first, I'd see him being indifferent to him. 'Oh, so dad fucked another kid into mom after what I did? Cool. What a piece of shit.' He'd respond more to Adam than Seth. But after talking to him? After hearing the condescending, pious way he talks down to everyone around him?
That's also how I see most interactions with Lute going, btw. And maybe Sera. But mostly Seth. Because Seth is an asshole, especially to the two of them, who were unable to live up to the expectations placed upon them by God, whereas he did.
"So that makes me better, of course!"
Finally, would Seth be protective of Abel? No. Not even a little. I'm not sure why you'd think that. As far as he's concerned, Abel was the 'weak little bitch who got himself killed--' (Adam's words, let's be real) '--and needed to be replaced'.
That's my interpretation of him, anyway. I think he'd be the worst kind've person to be around, but who's charismatic enough that he can get away with it. Glad you like him, though. I do see the potential in him creating fun or angsty scenarios, at least.
