Here's my character submission.

[hider=Ice Knight]
[b]Name:[/b] Ethelred

[b]Age:[/b] 134 (26 when frozen, only recently thawed)

[b]Gender:[/b] Male

[b]Appearance:[/b] [url=https://pbs.twimg.com/media/E7unZEvWQAUK-Vl?format=jpg]Ethelred currently cannot remove his armor, thus it is all anyone sees of him[/url].

[b]Abilities:[/b]
Ethelred was altered by a malevolent unseelie's curse, and is now what he has deemed "kin" to ice and snow.  Freezing temperatures do not harm or hinder him, and he can see through ice, allowing him to navigate snowstorms and see through his frozen helmet.  He can freeze things by touch, through his armor or even through the tip of his lance, and in enclosed spaces he can measurably chill the air around him.   He doesn't seem to need to eat or drink, and he's not entirely sure why.  He's also not entirely sure why the curse didn't affect his mind- perhaps the curse was flawed, or perhaps killing the fey stopped its progression before that point.

Another effect of the curse is that his armor seems to have fused with him, and taken on an icy, crystalline appearance.  The armor slowly "heals" any damage inflicted upon it, including any attempt to shave off its crystalline protrusions.  His lance and shield were also altered, but mercifully they were not merged with him.

Ethelred's [url=https://static.wikia.nocookie.net/darksouls/images/7/7b/SotFS_Kirin.jpg]horse[/url], which suffered the same curse as him, remains a loyal companion despite its twisted appearance.  Its horns and protrusions allow it to defend itself effectively, and like Ethelred, it's not bothered by freezing temperatures.

As a knight, Ethelred is skilled in the use of his lance both mounted and dismounted.  It might not have a cutting edge, but it makes for a brutal bludgeon and the tip is quite sharp, as the fey that cursed him found out the hard way.

[b]History:[/b]
Over a century ago, Ethelred was the youngest son of a noble family that controlled a small piece of land.  Being somewhat removed in line to inherit their land, he was never particularly interested in politics and intrigue.  Instead, he became a knight-errant, a wandering warrior seeking to emulate the heroic tales of the old king of Albion.  He traveled the land, helped people, and battled bandits and raiders who would prey on the weak and vulnerable, and occasionally even came into conflict with supernatural malefactors.  He never figured that his family would miss him- after all, he was the spare of a spare of a spare- and he reasoned they'd probably be more comfortable with one less potential claimant scheming to inherit.

While traveling through a rarely-treaded mountain pass, Ethelred was suddenly beset by a magical spell.  His boots froze to the ground, and a layer of ice began to form around them, spreading up his legs.  His horse fared no better, rooted to the spot by the same curse.  As Ethelred tried in vain to free himself, an unseelie approached, its inhuman voice chuckling at the knight's plight.  It gloated about how this curse was its doing, and how it would enjoy what came next but in the middle of its ramblings, Ethelred thrust his lance forward and stabbed the fey through the torso just before his right arm froze up, a final defiant blow.

As the evil fairy tried to pull itself free of the weapon, its face turned to horror as it saw the ice advancing along the lance.  The last thing Ethelred remembers as his head froze over is seeing is the fey frantically struggling as it too was encased in an icy tomb, a victim of its own wicked curse.  [i]It's not an entirely bad way to die,[/i] he thought as it went black.

The next thing he remembered was waking up on the ground, having been freed from his frozen prison.  Above him stood a radiant woman, sword in hand.  She spoke of the king's return, the beasts being slain, the fey facing retribution, and traitors facing reckoning.  By the time Ethelred regained enough strength to stand up and ask who she was, she was gone.  Stirring awake next to him was what he initially believed to be some sort of elder beast before he realized it was his horse, twisted into some sort of strange ice creature by the unseelie's curse.

It didn't take Ethelred long to realize that he too was changed by the curse.  His armor, which had taken a strange crystalline appearance, would not come off, including his helmet.  The freezing cold temperatures no longer bothered him, and found himself no longer growing hungry or thirsty.  His first was to interrogate the fey that cursed him, still frozen with his lance in its chest.  He attempted to free the unseelie by smashing the ice that imprisoned it, but this only caused the frozen fairy to shatter into pieces.  If it wasn't dead before, it was definitely dead now.  At least his lance wasn't broken, though.

With little hope of finding more information on this curse, he descended the mountain and found a changed land.  It seems he had been frozen for over a hundred years now, and things had gotten even worse in Albion over that period.  He also learned that the frozen forms of him, his horse, and the fey had not gone unnoticed, and had gained some local fame as "The Frozen Knight", as both a landmark for those navigating the mountains, and as a symbol of human defiance against the Unseelie.  It was a relief to him that the local highlanders weren't afraid of him, and it was probably a relief to them that he intended to be the very symbol of human spirit and resilience that they had made him out to be.

Ethelred set out in search of the woman that freed him.  He traveled from town to town, helping the locals, taking time to master his new powers, and catch up on the state of Albion.  By the time he reached the queen to pledge himself to her, having decided her goal was a worthy one, word had already gotten around of his deeds.

[b]Anything else:[/b] 
About 40 years ago, his family got into a conflict with another noble family and ended up getting wiped out, and their castle reduced to a ruin.  The perpetrator of the massacre, currently the rival family head, is still alive but elderly, and Ethelred wants justice.   For now he's stayed his hand, either because he wants to help the queen establish a law of the land by which justice can be carried out, or perhaps he's biding his time because as the saying goes, revenge is a dish best served cold.

Another thing is that while he doesn't want to lose his powers, he would at least like to be able to find a way to take off his armor.
[/hider]