Little more Gregor backstory if anyone cares (typed over a period of a couple of hours spending most of it afk):
He's been dropping hints of this through the game, but might as well get it in the open OC-wise: Gregor does not have a good relationship with his father or brothers. The father is extremely no-nonsense and a fanatical Menelean patriot that put his sons through some intense training, both against him and each other, and he will not take Gregor's possible desertion well. The oldest brother is much the same way, though he feels more protective of his younger siblings. The second brother, on the other hand, has a gambling addiction and is in some ways the black sheep of the family. He doesn't care about family ties except in ways that benefit himself, and the only reason the father puts up with him is because of his skill with a sword.
Next came Gregor's sister, already mentioned. She was to become trained in the art of war until her magic abilities were discovered. Their father had no love of magic, but decided that having a powerful mage in the family could only increase the power of the von Hexham clan and gave her his blessing.
And then there's Gregor himself, Mr. Can't-Catch-Up, the one for whom being a soldier was a third choice rather than the only choice. What can he do to distinguish himself when his father has "seen it all" already? Time will tell.