Eins

For the elements, silver and iron. For the foundation, stone and the Archduke of Pacts. And for the ancestor, my great master, Schweinorg. Close the gates of the four directions. Come forth from the Crown and follow the forked road leading to the Kingdom. Fill, fill, fill, fill, fill. Repeat five times. When each is filled, destroy it. Set.
Heed my words. My will creates your body, and your sword creates my destiny. If you heed the Grail's call and obey my will and reason, then answer me! I hereby swear that I shall be all the good in the world. That I shall defeat all evil in the world. Thou Seventh Heaven, clad in the three great words of power, come forth from the circle of binding, Guardian of the Scales!
[This is a master (haha) post for Fate/PSLs! If you need anything specific tailored to your character (like a starter that doesn't start with the summoning like the above) let me know! We'll work something out over PM or Plurk.]

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The identity of her class is perhaps a bit obvious with the bow and quiver stocked with arrows slung together on her back; she is an Archer, though a diverse skillset allowed her to be summoned as a Caster, as well.
The armor she wears is decorated with skulls and points. Beyond the Grail's magic that makes her a Servant, Sylvanas still flows with the cursed, evil magic that once ravaged her, that left her as she appeared before Rin. Undead. A banshee.
Dramatically long eyebrows furrow together, a dull scowl on her face. Red eyes that seem faintly to be glowing glower down at the frail-looking girl meant to be her partner.
When she speaks, her voice is almost tinny. There's an unnatural tint to what would otherwise be a beautiful voice. She asks with some sarcasm and a bit of loathing: ]
Are you my Master?