Volug: 9/10. Normally I'd rate him a 7, but silly Volug anti-hype makes him a 9.
Anyways, onto the actual rankings
Mana Khemia
Vayne Aurelius: 7/10. Reasonably solid. Good crowd control and damage options yeah. A Support is kinda lame. D Support isn't great but it can be used against physicals to save your other supports from use (like Muppy/Pamela).
Jessica Philomele: 6/10. Very weak early on. But timed healing keeps her up. Once you start getting better and better skills and the healing is less needed, Jess' damage doesn't improve, but C.Skills keep her in the running and her D. support is pretty awesome.
Nicole Mimi Tithel: 7.5/10. Probably game best PC? I haven't used her all that much, but yeah, speed and damage. That's probably good enough.
Flay Gunnar: 6.5/10. Pretty beastly against bosses, what, with his A support and damage. Speed's not that great for randoms though.
Pamela Ibis: 5/10. Yeah. Nothing special early on (in fact, kinda weak). Later on though, she gets some hilarious niches (Manipulating her own HP for No Bullying! and Seeker) and the D support makes her very worthwhile to keep on the backline to save your Jess D Support. Immortal Body feels kinda pointless, but could serve use I suppose. Can use C.Skills as damage options keeps her somewhat afloat during the worth lag periods.
Roxis Rosenkrantz: 7/10. I want to give him higher, but laggy start prevents me from doing that :|. C.Skills means he always has a back up damage option and his skillset has got some good niche options (Purifying and Retraction are both great). Once he gets the Light Mana, his damage starts picking up. To make up for this...his supports just flat out suck (lulz at his D support in particular). 7 is reflective I guess.
Anna Lemouri: 5/10. Support Options keeps her in the running. Instantly taking a turn whether on offense or defense is very nice. Her damage needs some work since she lacks it without blowing chunks and chunks of SP, and even then, it doesn't beat the big guns like Flay or Vayne. Still, decent though.
Muppy Oktavia Vondercheck VII: 3/10. Bad, but best D support in game. That's better than what some of the FE characters below can say about themselves (hi Shinon9)
Fire Emblem Archers, Cats and Wolves:
Wolt: 2/10. lolWolt
Dorothy: 3/10. Better than Wolt, but not exactly top tier material either.
Sue: 6/10. Pretty good. Strength could be a problem and IS a problem early on against armors.
Shin: 7/10. Gives up some speed for more strength. Noticable winning trade in his favour since his base speed and growth aren't sucky. Fir support as a bonus to boot.
Klein: 1/10. lolKlein
Igrene: 3/10. Filler, but is an GBA Archer Filler. So...not that good, but better than Klein (insert more lulz for Klein)
Dayan: 2.5/10. He's got a horse! And like no strength whatsoever. But he can kinda scratch Wyverns! That's something.
Wil: 3/10. Pretty bad. Wil has some strength and Lyn mode running for him though. If he gets lucky with speed, you may consider deploying him. Good support options to boot. Too bad about being stuck as a Sniper and generally won't get said speed.
Rath: 4.5/10. Rath's worth giving a shot. Nomadic mount makes Desert less painful on him and gaining 1 range after promo makes him the superior choice here if you must have a bow user not named Lyn. Still, lame join time.
Rebecca: 3/10. Start is lame. Once she gets going is better, but isn't fundamentally doing that much better (still lolArcher promo and no 1 range here)
Louise: 4/10. Well Auto A with Pent, if nothing else. And Pent's likely being deployed. HP is lame, but isn't terrible.
Neimi: 6.5/10. Probably the best GBA Archer you're going to get. Better promotion options, best support out of the gate, and even though start is weakish, it's still somewhat better than Becca's. Yeah.
Innes: 4/10. I've had Innes turn out pretty damn solid everytime. He still can't beat average though because lolArcherpromotions not in FE10. At least he supports with some quality units (Vanessa, Eirika, Tana) so you can use him as a ring supporter at worst.
Shinon(9): 0.5/10. Man, if you EVER needed an example of where bases > growths, this is it. Shinon9 is the equivalent of KARLA more or less, except he exists early on and can do...something. He can't even properly chip due to crit, but being there means he does something relevant especially since early on, everyone is kinda weak. So his crap bases don't stand out as badly. Fast forward to Chapter 21...and Jesus Christ, now you realize those bases are just shitty. It doesn't matter that he has MONSTER growths. He's so bad when he finally rejoins, it takes a ton of effort just so his growths will eventually get him to...averagish and stuck to a pretty bad class. gj? gj. Or, in the words of the elf: lolololololololololololololololololololololololol
Rolf(9): 1/10. Uh...he's better than Shinon because when he joins, you can still try to use him and he will turn out better than Shinon! Word. Also you need him to recruit Shinon! Double Word. Like the equivalent of the Karla analogy, is essentially Bartre, but without Bartre's good stuff, like hitting power early on and HP. This is the way.
Lethe(9): 6/10. Jeigan with a noticably quick transform time. Eventually drops off and FE9 non-royal Laguz issues hold her back though.
Astrid(9): 7.5/10. Somewhat slow to start, but pretty destructive once she gets going, which honestly doesn't take long. Being mounted of course makes her a very solid choice to invest in. IIRC, supports are somewhat weak and no 1 range countering until promote hold her back from the other better pallies though.
Ranulf(9): 2/10. I can't really find a reason to use Ranulf9, like ever. He's basically Lethe when Lethe has already fallen off. On the situation you are using Lethe, she's probably better than him anyway. Usable filler I guess. But then again, FE9 Laguz issues.
Leonardo: 3.5/10. Yeah. Luggy bow basically saves his sorry ass. He would be like a 1.5 barring that I think? That weapon is just too good.
Volug: 9.5/10. *eyes Rozalia*. Oh well. This has been discussed to death. And I personally think there is something wrong if you really believe EDWARD is better than Volug. But whatevs. For those of you that missed it: Most durable member of the DB, never gets bad, always solid, can even fill in as a good part 4 choice, Earth affinity and is around on those really nasty missions. I would argue Haar being better, but Volug is certainly one of the best units you will get. End of story.
Nailah: 9/10. *checks what he gave Naesala*. Yeah, 9 feels around right. I would argue on some level, she might be even better than Tibarn, but...the score differences would be like tenths of a difference.
Lethe(10): 4/10. Potential. Worthwhile potential. You have better units, but it won't hurt you to use her at least.
Astrid(10): 1/10. lulz. At least she can take pot shots and has movement. The sad thing is, you can't unequip that Paragon until Part 3, so you have to make sure she doesn't kick the bucket before then, else you lose a Paragon :|. Thankfully, 2E is the only chapter in question here, but 2E has Elincia and Haar as clutch. So, no score detraction here.
Shinon(10): 7.5/10. Shinon on crack. Bases are so much better. His growths are still good in some key areas (45 Def, 60ish for speed? Hell yes). Only thing is his somewhat lacking strength. Deadweight on counter phase skews him though and prevents him from being higher. Unless he wants to use lolcrossbows. Shame for that. If he actually had 1 range, he would probably be around Mia level. Tied for 5th best of the core GMs with Oscar I feel.
Rolf(10): 6.5/10. Feels weird at first, but if you take a closer look, their differences aren't as profound as they seem. Shinon's high starting level is somewhat double edged because those enemies he kills early on won't give him good EXP gains. Enter Rolf, who's gaining more EXPs, and his own growths are pretty solid. Strength being wtf. Durability could use work, but they would only become relevant against 2-range weapons, and he shouldn't be getting attacked that often anyway. So yeah, maybe some docking of points there, and its pretty minor. He is worse than Shinon though, since if his speed tanks (which could happen), it is MUCH harder to fix than Shinon's strength. Shinon can go crit forges, strength forges and supports to remedy it. At worst later on, he has an Occult. Faster speed means he gets more chances for it to proc. If Rolf's speed tanks, that's it. Other than getting him more levels or blowing a speedwings on him. And there are two other PCs who would love the Speedwings (Titania/Haar), so that's a no go at all. Think...that's enough for a full point to me today. Could easily see him being a 7/10 PC though.
Lyre: 0.5/10. She only gets 0.5 for existing. Barring that lolz cat transformation problems + speed equivalent to Kyza's with like half the defense and strength.
Ranulf(10): 6/10. Mmm...yeah. Cat transformations sink him. Shame, because he's pretty solid otherwise in Part 4, and is pretty clutch in Part 3.