Definitely Boril. Not much love for Agwe around here.
Yeah, Rigard is one of those show-stoppers that you have to level. I had to leave off leveling my Domitia after I pulled him yesterday. Of course, so is Proteus, so you’ve got a decision to make there.
Not so sure about prioritizing Khagan. Right now, taking him to 2^60 seems to make sense (assuming this is your whole roster), but if you are already short of gloves, I wouldn’t use those on him unless you have or will soon have the mystic rings to max him.
Same caution about Guardian Owl. If you don’t have the darts, don’t use the gloves for him. You’ll probably get many more sets of gloves before you get the darts. I can’t speak about Hu Tao, as I don’t have him, but I was pleasantly surprised with Danzaburo (now have him at +6). If you don’t have any other yellow options besides what I see here, maybe consider him. There are several threads about him on the boards if you want to research first.
I’d be hesitant to use emblems on a 3-star if I had a 4-star option, so probably LJ over Namahage.
I’m having the same debate on cleric emblems. I’ve recently pulled (and am currently leveling) both Boril and Rigard. Rigard is the better hero overall, but I’m leaning toward Boril for the emblems so he can be my defense team tank. Only you know how you plan to play and how important your tank will be to you. Right now Danza is my tank, if that helps you any.
I wish I could help you on Kiril vs. Proteus, but I don’t have either. Since you have Kiril near max and Proteus not yet ascended, I would think this is only a debate if you decide to ascend Proteus with your gloves now (which would be a very defensible decision, imo.) Good luck.