[quote=@Lugubrious]

Your estimation was correct.  In his current state, he would be impossibly overpowered for the sake of the RP.  Unbreakable defense, insurmountable strength and skill, incredible magic, not to mention brains and looks...forgive me, but he almost seems Gary Stu-ish.  The best way to start reining him in, I think, would be to take two aspects of his combat ability and completely excise it.  The four main departments -defense, strength, skill, and magic- could be cut in half.  He could forego his armor and magic to arrive at a very strong glass cannon with pronounced drawbacks, or sacrifice all melee prowess in order to become a magic-raining bastion.  Of course, even the remaining aspects would need to be toned down somewhat.  The alternative, of course, would be to nerf all four aspects down to a reasonable level.  I hope that even after these necessary nerfs, he will still be a character you'll love to use again.

I'd recommend taking a look at the characters that have been accepted so far to get an idea of the general power level.  I'm looking for either a couple high points, or a lot of medium points in terms of power.  The stronger a character is in a particular area, the greater the drawback I'm looking for in an oher--balance is the key.
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There's not really a section for weaknesses per say, but were there, I would discuss how contact with sunlight burns his flesh and saps his strength. How silver and living wood cause festering wounds, and that he goes blind from looking at moonlight reflected in silver or in water. How he must feed on the blood of the living to survive, and every passing day that he abstains drives him closer to the precipice of madness, like a rabid dog straining against its ever-weakening leash.

I present these vampiric weaknesses because altering how he is now kind of disassembles his entire character. He's an ancient legendary hero... who's a complete dumbass. He's a heroic paladin... who can't use magic for shit. A juggernaut of steel... but a stiff wind blows him over. He's been fighting for centuries... but he's as good as some guy that's been doing it for less than a decade. See what I'm getting at?