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Best: Ike

Me I'm so awesome. I really, really thought about this one simply because I want to give a fair unit for the game that I have absolutely loved playing. Unfortunately, aether is such a broken skill that I have to pick Ike mainly because he can practically solo the entire game by himself. That and the fact that he sticks with the player the whole time (I know it's a given since he's the lord, but he's actually a lord that I really enjoy using along with Hector, Ephraim, and Lyn.) and Ragnell is a very awesome sword. Otherwise I'd say that Stefan, Soren, Oscar, and Nephenee are all close follow ups.

Worst: (His not so capable sister) Mist

I extremely disagree on pinning worst on my poor granddaughter and Calill. Bastian is far less capable since he comes at a much higher level with less room to grow making it easier for Calill to surpass him. Ena, yes, is quite weak, but her growth rates allow her to actually surpass even me. No, I believe the worst unit in this game has got to be Mist. Valkyrie is just a horrible class in the game with healers on horses doing nothing against enemies because swords use the unit's STRENGTH stat (shocking I know), not their magic (Unless you're using the frinkin sonic sword that Tanith comes with, but that's a different story). Sure she could run around killing mages, but that's what other anti-magic units like falconknights are for. Elincia could do a much better job than her and at the beginning her extra healing is just subpar next to Rhys. Oh, and using her just for the Black Knight is silly, in my opinion, since Ike could get drunk off elixirs and activate aether fifty times without Mist's help. Poor average stats, poor caps, and when there are better healers out there (Rhys, Soren, Elincia, Ilyana) I don't think so. >.> I think Sothe is a close second, but at least he can pick locks..for FREE while Mist can just stare at them clutching her staff.

Best: Ike

Worst: Calill. I never had a good use for her aside from one chapter for Meteor. She never turned out good for me.

Best: Ike
Only for this game, buddy. Nilah and Tibarn beat you ten fold in the sequel. >_>

Worst: Calill, you get her in chapter twenty, not worth it besides the Meteor. I mean, you have Soren who has speed to hit twice, and Illyana (who is cuter) who has more power then her as well.

._. -Knows on his part he put her there because he has never used her that much- I've found Bastian to somehow be useful though...yeah don't see the logic there.

Anyways on my part, also put her there because I couldn't remember that many units. Changing mine to Sothe for reasons already placed in Rath's post

I have to contest you, Sue, sorry. You can still very well use Shinon, and he's actually in his 2nd tier already, so he's not that much of a burden to raise.
Rolf:
HP | Str | Mag | Skl | Spd | Lck | Def | Res
43.8 | 23.2 | 9.6 | 27.1 | 27 | 19.2 | 19.4 | 13.5

Shinon:
HP | Str | Mag | Skl | Spd | Lck | Def | Res
46.25 | 21.35 | 9.8 | 28.3 | 25.35 | 15.65 | 18.5 | 13.6

He's really not bad... am I saying he's worth benching the Rolf you've raised just to work on him, now? No, not by a long short.

Can you say it's worth benching the Sothe you've raised, once you get Volke? Absolutely, because Sothe can never possibly even come close to achieving what Volke is, because the game won't allow him to promote. Give the blossom to somebody else that can put it to use and leave Sothe on the bench. there's no true need of him and there's no point in using such a heavily limited unit.

Best: Ike.

Need I say more? He has really nice growths, gains exclusive access to Ragnell, which allows him to attack 1-2 spaces away, and it's got unlimited uses and can hurt Ashnard with his blessed armor. It's almost impossible NOT to use him, considering he's the first guy you get and he pretty much always turns out well.

Worst: Gonna have to throw my vote at Ena for this.

If you get Ena, you lose Nasir. I don't recall much about her stats since it's been years since I played FE9, but I don't remember them being all that great. But stats aren't important here. It's availability too, and frankly she comes in pretty late in the game, so you have almost no time to raise her except for that last chapter. Mist is at least a healer, regardless of how shitty she is, and you can never have too many healers. Sothe is at least a thief, which saves you on utility more than anything.

Best: Reyson

Before anyone votes Tibarn, Nailah, Ike, or even Haar or some other actual attacking unit, hear me out on this:

-Transformation items are readily available in FE10, so it’s perfectly reasonable to grant Reyson access to Laguz Stones and Olivi Grass, and Laguz Gems later on. You give your fighting units resources; Laguz – support or otherwise – should be no different, especially for the sake of comparison. And Reyson definitely benefits from them the most.

-That in mind, Reyson also has quite good availability, something the powerhouse units such as Tibarn and other Laguz royalty don’t boast.

-Also, Reyson doesn’t need any training whatsoever at any point in the game. Sure, he gets it just by you using it, but never will you ever have to worry ‘oh, Reyson needs more leveling and experience.’ He gets some neat perks for hitting various levels, but the most important function he performs requires no additional experience, and the nature of his role and possession of Canto easily allows him to remain out of harm’s way.

But it’s these various notes combined with the existence of a plethora of kick-a** units that make Reyson’s support worthy of the title of best unit in the entirety of FE10. Consider: only with a Heron is it possible to finish so many of the Endgame chapters in so few turns. Really, Canto to escape danger combined with a four-person refresh, the ability to restore status just by standing next to people (you’re silencing my party in Endgame-1? I don’t care – I’ve got Reyson), good availability and a good support affinity takes utility value to completely newfound levels in the entire series. Whomever you happen to think is the best FIGHTER in the game, Reyson has the capacity to grant them and three MORE awesome fighters (or healers if you’re in a jam among other things) act twice, so in terms of contributions to combat, Reyson functions as a mirror for up to four of your strongest units. Granting four powerful units the ability to act again is way more impressive than simply being one of those actual units and acting only once or even twice. It also allows for a much greater diversity of tactics and actions that wouldn’t be possible otherwise and means more experience for all of your other units since the combat experience is getting split between fewer people with a Heron around. Everyone wins with Reyson around.

Really, just looking at the mechanics of the game, I see it as necessarily impossible for a combat unit to be 'better' than Reyson (or Rafiel depending on a few things - I happen to think Canto is essential to Reyson's success, besides the fact that Reyson has much better availability). Reyson has all the utility of any combat unit you have in the game, but with the capacity to grant it to three other awesome people. The things he allows you to accomplish are just too epic for him not to deserve the title of Best in FE10.

Worst: Fiona

It's a really close race between Fiona and Lyre. They're both just so, so, soooooo terrible. I'm going to give it to Fiona simply because when it comes to attempting to getting these units out of the terrible holes they're in, it turns out Lyre is much easier to work with. Lyre makes better use of most stat boosters since their value doubles upon her transforming. Lyre also uses Bexp more efficiently since her growths don't go to as much waste and once she reaches a point where she can actually Bexp Abuse, she gets to keep it while Fiona will change classes pushing her caps up higher and requiring even more levels before Bexp Abuse becomes possible. Lyre isn't hindered by the geography of the chapters she's in which can't be said of Fiona, also (they're both available for five chapters before part 4, so neither has an advantage in that department - although Lyre's chapters are closer to each other). Really, even if through extreme favoritism you DO manage to get Fiona to second tier by part 3 so she'd be usable, the first chapter she'd be available in, her horse handicaps her movement because she can't go into the water at all. The defense chapter that comes a bit later isn't granting her any favors either, and makes her good mobility quite negligible. Using either is a terribad idea, but Lyre has less against her, to say the least.