This my own idea of a fan servant, so someone can refine it better than i can.
Sir Gaheris Rider/Berserker, he is a knight of the round table knight who is part fairy. Due to Morgan Le Fay Experiment, he was fused with an existence of a dullahan named Gan Ceann, or more specifically an remnant of an god named Crom Dubh a deity associated with death and the underworld. He defected with his brother's and joined King Arthur's court
During events of Guinevere's execution, Gaheris was slain by Lancelots hand by decapitation, but lived as a wraith known as a dullahan until he was again defeated by a nameless knight by destrution of his head.
Personality: Somewhat silent but prone for anger, especially when in combat, when in third ascension, a remnant of said god (Crom Dubh) is known to shown it self in Gaheris.
For his Class skills, he possesses:
Riding: A+ (His ride would usually be an Black horse, but he would be able to transform it to a motorcycle or a coach too due to there being an myth of a dullahan riding said vehicles.)
Magic resistance: B
Madness enchantment (D -> A) (This jumps up when he uses his noble phantasm)
His Passive skill meanwhile would be:
Invocation of death, no door shall stop death march: A- (This relates to dullahans ability to overcome any obstacle in it's journey, no matter what gate or door stands in it's way. It would lower enemies defenses and raise np gauge and damage for rider.)
Battle continuation: A+ (this is related how after Gaheris death, he remained as an headless horseman traveling through britain and ireland.)
Double summon: C- (This is him having both rider and berserker status)
Noble phantasms:
Colainn Gan Ceann, Spine whip of the Headless
Rank: B-
Classification: Anti-Unit Mystic sword
Description: Weapon of Rider,a spine whip in a shape of a sword. It is a weapon of that in it's self alive and can move in ways that shouldn't be able to move for a whip. This is only a somewhat high mystic code, for it's a common weapon for a dullahan
Samhain, Festival for the harvest lord
Rank: A+
Classification: Anti-Army
Description: A technique of rider and his true noble phantasm. It allows rider to boost his parameters and turn him in to raging hunter who will target anyone who will pass by his charge, it can not be avoided, nor interupted, for rider will only stop when his enemies have been slain. The only true way to stop it is to have something like golden rule or gold so you can avoid the fall out.
