Small description: He has fought for his survival since he was little, he was witness to many civil wars so he was trained to fight for his race, a race of supreme unicorns had to intervene, caused a huge bigbang and left very few surviving bat ponies, including him, despite this, many around him fear for him (because being an assasin), but for the night unicorns he'd be an excellent night guard, he has also conquered the heart of some mares (and stallions)
About her: He spent many years working for them, he was training his future successors because he was going to retire, when he was on his way home, he found villagers in trouble, he attacked the bandits, one of them died, and for that he was taken into custody, he was later forgiven when the officers read his background, now he works for justice and avoids killing someone else, only leaving the bandit in a serious condition.