True identity is Yuki (well, i'm obsessed with the name yuki XD), in an alternated universe than the one the grail war takes place, Yuki is the mystery of all the legends, although not often, bits and pieces of story can be found through out the known history. She was called the Outsider or the Guider, she travels around the universe, never staying long at one place.
That's what the people there know of me, but I am entitled Judgment by the very creator of that universe himself. I was mortal, and was chosen, for whatever deeds i cannot remember, to be looking out for the universe. Where i stay, i observe, the lives that thrive. The creator always acknowledge the beings that are able to emerge, stand out from other beings on the planet, and encouragement, to those that use their own strength to go beyond. He had wanted to do more, but found that he is more exhausted from the creation than he had imagined, before he give in and let himself become one with the universe he created, he freezed my body into the eternity of the instant, never aging, never dying, and he gave me what was left of his power. I was told to personally travel the universe, recording the history of the star with my own eyes, and give subtle guidence to the ones that walk on the path harmony, or to give destruction, to the ones that walk the path of grief.
ages and ages went by, many stars is born and gone, i have finish wut i was instructed to do, the people are living in harmony now. By this time, my powers seems out of place, and even if harmony is achieved, some of the greed is still in the souls of the people, and i wish to to use the grail to break the time freeze on me and to return my power back to the universe.
my weapons are the two fans and elemental manipulation (fire, water, lightning, wind, earth) elemental powers cost considerable amount of mana (well, it depends, if its just calling the help of natural spirits it nearly don't cost mana at all, but the bending of the the elements natural form cost a lot of mana to control), so unless really have to, i won't use them. there is also one natural ability, gravity manipulation, but only on myself and to whoever thats in physical contact with me at that time.
Noble Phantasm--"Homing Star" summon several (depend on the need it may reach thousands) balls of lightning and fires at enemy, master and servant alike, unless it hit something, it will never stop chasing.
Noble Phantasm--"Wind Bust" its known to current day people as the Sonic Boom, forcing the very air in the immediate proximity to instantly reach the speed over 1 mach, whoever got hit by the blow, its as if an invisible wall smash into you at impossible speed. as it involves swinging my fan with inhuman speed, even though magic is put into it, this skill will render that arm useless for at least a week.
Noble Phantasm--"Ice Shield" depend on the situation, it can be the shape of a normal shield, or a full half sphere, "Ice Wall" forming a wall of ice, depend on the need it can sometimes reach the size of glacier, "Ice Spike", requires Ice Shield or Ice Wall already casted, a shock wave is send into the solid ice, shattering it to piece and the pieces will then shoot at the enemy.
Noble Phantasm--"Meteor Shower" literally what it means, "Earth Fire" concentrate mana into a punch and drive it into the ground, volcanic fire explodes in a straight line in the direction i'm facing
Noble Phantasm--"Blaster's Eve" forcing raw wind, fire and lightning power into single strike and fires it upon the enemy, it is an energy cannon blast reaching 100 metre in diameter, vaporize anything in its path. takes out half of my mana.
Noble Phantasm--"Eternity of the Instant" freezes time for an instant in which i unleash all the Noble Phantasm above several times. WARNING: my body will shut down for several days after this
to summon me, one would have to go up to the highest place found with overlooking view to the city and the night sky.
(did i go overboard there?)