so far a leader, scholar and warrior, but its how they cross paths is the interesting detail, maybe the scholar and leader met before they found the warrior
on further note, maybe the leader found the warrior in a fight with Roman soldiers when they met and he was basically tearing them apart, and once the blood shed had been finished, covered and dripping with blood and slowly leaving a blood filled fury, they could approach, dont wanna walk up to a gangrel when he is at the peek of his blind rage, but anyways, and they discuss matters at hand and he joins their group, after he was convinced of course, gotta remember he was a gladiator, not really trusting of any form of authority, it was authority that made him become a ruthless killing machine, if you send him into fight and it happens to be in a small village, might as well burn the village to the ground like it had the plague, he will slaughter everyone, he is going to be brutal and savage, well he was in the romans eyes before he became a Creature of the Night, a barbarian or savage, so his outlook, is pretty much a muscle bound brute with no care for pain, plus that is one problem with him, its his pain tolerance, but you look at most vampires when it comes to the sun and it hurts, him on the other hand, he had the meaning of pain beaten out of him his hole life, from his family, parents and older siblings since he was a small boy, and the training he partook in as a gladiator, pain was beaten out of his body, he could put his hand over a flame and instead of saying "ouch this hurts" he will look at you without a care in the world, he is also fearless, he could look at say, the scholar, summoning undead minions, or the leader with his authority and sent his best guards, he would basically laugh and fight till he was ash or they were, no means of fear or pain, he was made into the perfect killing machine