3. I don't think he misses anyone except his sworn brother, Saejima. He misses him a lot. And...there are a lot of other conflicting emotions tied in there right now, too, since at this young age and very specific time of his life... he's all fucked up in the head currently.
4. I kinda hate to answer this one. It would be Kiryu if he knew Kiryu yet. And I'm not sure he actively admires anyone yet, either. I think right now he envies people more than admires them.
Later, he kind of admires Sagawa for his (bravery at the end?) determination and being what he wants. And then Nishitani for being as crazy and himself as he wants no matter what's going on or who thinks what of him. That definitely sticks with him.
I'd say he probably admires Makoto a bit, too. For her strength and determination and willingness to try something hard to get what she deserves. And for simply surviving it all and turning out okay.
10. Oh god. Shimano. He hates that fuck but of course can't do a damn thing towards him. And, uh, what was that fuck who told him to fuck off.... yeah, that asshole for getting in his way of getting to his brother.
Look, I always love memes and then regret them when I try to come up with answers and feel like they're horrible or off somehow. I always feel like I'm missing something I forgot...
12. A valuable lesson.... Probably all the people I've named so far, tbh. Most of them bad things or what not to do... things he decided he didn't like and didn't want.
But a few gave him ideas for his own way... and some good things like from Makoto and her strength, (but also maybe bad because he loves her and yet gives her up for her good rather than his own) and jfkdlsfj I'm gonna get sidetracked if I keep down that line of thought ahhh. /clutches heart.
I think he also probably learned that if he wants something he's the only person that can give it to himself, to achieve that goal for himself, and no one can do it for him. Sort of a joint lesson from all his interactions.
Yeah, he has to play by the rules (because he's dogged and old-school honorable as shit) and he has to use people to get there sometimes, but he has to determine what he wants and how to get there by, essentially, his own means in the end.
2. I'll come back to this one, because otherwise it's just gonna be the same as 3. XD