Zelgius as FE10, abstain on the labels for Elincia and Sothe.
Fire Emblem: Radiant Dawn (and series)
Ashera: 4.9. Hm. Rewards good MT, which I always like. Unlike the other endgame bosses I do scale dragon boosts against her defences, punishment for her lack of support outside the auras, which keeps the high-res auras from having 1.5 PCHP and leaves them a little under PCHP (the high-def auras have like half PCHP to magic, and ITD just carves them a new one, of course). So even most duellers with MT (unless it's uber like Megid) still need two shots, though by no means all. Her own turns aren't that uber-scary (lowish 2HKO to either defence, or 30% silence!) so good healers or really tanky bosses can take her out with ST too (she's not close to auto-win like Belial).
Caineghis: 4.7. Man, that pdur is good stuff, even if not as good to me as it is to the stat topic. He can be stopped from being doubled, though, and isn't as anti-status as the other FE10 royals.
Elincia Riddell Crimea (FEs?): 4.5. Equal exp should make her better than the stat topic currently suggests. I'll assume it doesn't get her to doubling average, though. EDIT: I was wrong. So yeah, she's a chibi royal, or perhaps an improved Tana, with bad concrete durability but coinflip evade and OH GOD WHAT IS WRONG WITH THAT DAMAGE.
Kieran (FEs): 3.1. Not a great Middle but can still manage.
Lekain: 3.0. I was thinking he was Middle but the pdur may be too bad to take advantage of silence often. Still outslugs way too many Lights due to counters and nearly 2HKOing average. Others can decide his division.
Marcia (FEs): 3.6. Doubles average, some okay durability, etc.
Micaiah: 3.5. Yeah, this is one of those plot claims I definitely buy. Not only is it very explicit, but you get two tomes and who else is going to use them, really?
Nailah: 4.7. Same ranking as Cain works. Isn't a death tank but has loads of evade/better res, has less damage at base but harder to stop from doubling. Balances out.
Oliver (FEs): 2.7. Surprisingly better than I expected. Definitely not Low Light.
Sanaki Kirsch Altina: 2.8. Well, she hits pretty hard at least, so if you use ST and don't OHKO or double her you're in trouble. Neither is nearly as easy to do so as you might think. She'd be the trash Light Super kneejerks her as if she didn't get that Rudol Gem, so her def is actually pretty okay (HP does suck, though).
Sephiran: 4.5. Durability works out to pretty close to PCish, ITD makes him explode. Trigger a counter and don't block Light and he's going to beat you for certain, which is pretty cool, and stallers fail utterly against him due to the regen not to mention the threat of crit and Corona. He has his spoilers, but still dangerous in the division. EDIT: Sure, borderline works due to the regen probably stealing more fights than I was kneejerking. Doubles and such do exist, but yeah.
Sothe (FEs?): 2.8. I think he can do damage in Light, but still Light. Rennac with worse damage (*sobs*) but better speed and ranged counters.
Zelgius (FEs?): Man I'm never sure how to take him. Think just treating the temp as an endgame PC works better for me than a the solo boss, which probably ends up around the same place anyway. Anyways, great pdur, decent mdur, some nice regen, and a kickass mastery. He doesn't double average but he does have 1-2 range. 4.5 works, others can decide his division.