Gwyn Gaiseadh

"What do you mean you guys don't eat squirrels? You should try some, they're good!"

Gwyn Gaiseadh is a character created by SYTOkun and inhabits the RWBY: Visions universe. She is a member of the Wild Hunt, an organisation of rogue Hunters, and is the apprentice of the Lord of the Hunt. Her weapon of choice is Malice Striker, a segmented sword.

Appearance
Gwyn is a girl who stands out for having a pale, almost sickly pallor to her skin. Combined with her greenish white hair and striking green eyes, she has often been described as corpselike.

Her hair is messy an unkempt, with a single side tail on the left side of her head, held by a braid. She has small, thick eyebrows, and also has pointy teeth.

She wears a pale green tunic and red pants. She wears armor over these clothes, including pauldrons, an plated belt and metal bracers.

Personality
Gwyn is cheerful and quite naive. Having been raised outside the Kingdoms, she lacks many of the social graces of a normal person and so behaves in a way many consider wild or brutish, such as sleeping on the floor in public, foregoing utensils while eating, and chasing small animals.

Gwyn is quite excitable and curious, especially regarding people from the Kingdoms, who seem as alien to her as she is to them.

History
Gwyn was raised outside the Kingdoms, in a small, obscure village in Atlas.

Her Aura/Semblance was awoken when she was a child in the wilderness of Atlas. It started with dying pets, then livestock. One day after playing all day with the other children in the village, they spent the night sleeping huddled together in a barn. When morning came, one of the children was already dead and the others were severely weak. Only Gwyn was unharmed. Her hair and skin also began to change. The villagers suspected Gwyn was cursed.

Gwyn's father grew wary and fearful of his child, but her mother fiercely defended her. Sharing a close bond, Gwyn's mother refused to believe her daughter was cursed and constantly embraced and played with her, her life draining away with every passing day until she finally died. Unaware of the nature of her Semblance, very few of the villagers, including Gwyn's mother, had an activated Aura and so were very susceptible to her Semblance.

Gwyn's father, in a mad rage, threw Gwyn out and disowned her, leaving her to wander in the woods alone. Warnings about the cursed child spread fast enough that they recognised her by description alone and ostracised her wherever she stayed. Every village she went to cast her out as a cursed child as she spread only death wherever she went.

One day, the Lord of the Hunt, leader of the Wild Hunt, found the forsaken child half-dead, nestled between the roots of a dead tree during a blizzard. He nursed her back to health and raised her as his apprentice and surrogate daughter. Having a strong Aura, he was resistant to her Semblance and was able to gain her trust.

Gwyn is intensely devoted to the Lord of the Hunt, Sylvain, and treats him as her father. They share a close kinship, as Sylvain shows no fear around Gwynn’s Semblance, knowing she lived a life of isolation because of her gift.

Combat & Abilities
While a nice person once you get to know her, Gwyn was raised on the harsh ways of the Old Hunt, trained to kill both man and Grimm. She is relentless in combat, almost animalistic at times. She is surprisingly agile, darting between trees and climbing them with remarkable speed in order to confuse and instill fear and paranoia in her opponent.

Weapon
Gwyn's weapon is Malice Striker, a segmented double-bladed greatsword. Its two blades are parallel and pivot around joints along the sword's spine, like scissors. The pivot points of the sword are coloured a bright lime green and resemble the eyes of a dragon. There is a barrel at the end of the sword's spine, where it can be fired when the blade in plunged into an object or target, inflicting serious damage.

Semblance
Gwyn's Semblance is Corrosion. Her Aura has strange corrosive properties that counteracts other Auras and rapidly breaks them down. People with unactivated Auras are extremely vulnerable to this effect and can die through prolonged contact with Gwyn's body alone.

Those with activated Auras are more resistant to these effects, but it appears Gwyn can amp up its destructive power and rapidly deteriorate someone's Aura, turning a fight into her favour. This increased effectiveness to her Semblance seems to be tied to her emotional state or her stress level.

It's currently unknown whether Corrosion simply wastes away any other Aura it contacts, or perhaps is siphoning or converting the energy in some way.

Trivia

 * Gwyn's alludes to Níðhöggr, the dragon/serpent from Norse mythology that is trapped within the roots of the World Tree, Yggdrasil. The creature gnaws at the roots of the World Tree, but also feeds on the corpses of murderers and oath-breakers.
 * Níðhöggr can be roughly translated to "Malice Striker", which is the name of Gwyn's weapon. The eye-like pivots on the sword also evoke the appearance of dragons' eyes.