And, because I'm the naughty kind of GM who likes to have a character of his own...
Name: Filias Osilius
I don't know who this actually is.
Osilius is an elderly, bearded man, but very fit for his old age. He wears baggy robes to hide his athletic frame, prefering to let people think of him as an old man, hardly worth their attention and hardly a threat.
Weapons and Armor:
Osilius doesn't wear armor, but he does carry a staff, one end of which is embedded with a soul gem designed to throw lightning bolts at opponents. The staff is carved from thick oak, meant to be sturdy rather than ornate, and can be used as a meelee weapon if the need arises. He also carries a silver knife that he uses as a tool for his alchemy, but as it's effective against supernatural creatures, he keeps it sharpened so that he can use it as a weapon as well.
Osilius is skilled in alchemy (and as a byproduct of this skill, cooking) and Alteration magic, particularly conjuring light. Osilius has keen eyes, and is sometimes able to detect invisible or ethereal opponents if they cast a shimmer. He's also capable of using his old age to fool people of ordinary intelligence--guards may let him go with nothing more with a warning, people may not pay particular attention to what he's doing, or he may pretend to be senile.
As stated before, Osilius is skilled in Alteration magic, his specialty lying in conjuring lights and transmuting ores. Sadly, the bulk of what he knew faded during his hiatus from service in the Legion, but he still possesses knowledge of the following spells:
Osilius gained his magical training at the College of Winterhold, managing to become adept in the arts of Alteration at a young age, then using his abilities to serve the Imperial Legion against the Altmeri Dominion. He was one of the few who made it out of the war physically unscathed, but not mentally so. He quit the Legion and devoted the twenty-six years between the signing of the White-Gold Concordat and the incident at Helgen to studying creation instead of aiding in destruction, becoming a naturalist and traveling to document the flora and fauna of Tamriel.
When news arrived of the attack at Helgen, Osilius was called upon by the Empire and sent to the province of Skyrim, where he would be expected to work with General Tullius and the Legion to find a way to end the threat posed by the dragons once and for all, so that the Legion may return its focus to putting down the Stormcloak rebellion once and for all.
Even though the Dragonborn is considered a mere legend, Osilius feels that there might be some truth to the myth that dragons may only be slain by his hand... and in a more selfish light, the old Legonnaire in him hopes that the Empire will be able to use the Dragonborn to defeat both the Stormcloaks and the Dominion, and reinvigorate the dying Empire.
Osilius travels with his assistant and caretaker, Maerin Aikaios, a Breton woman with strong features and long, dark hair, usually put up in a ponytail or a rudimentary braid. She fancies herself a spellsword, and thus possesses an aptitude for one-handed combat, though her magical specialty lies in Restoration magic. She wears gold-colored Adept's robes under a dark green traveling cloak and carries a steel sword on her hip.
Between the two of them, they possess a single horse, which they use to carry their supplies and provisions.