Exactly what I was thinking. His sentimentality, his reasoning behind keeping his own (heavily-used, now functionally useless) weapons as trophies rather than things from his enemies, his straight-up honesty, and what I could possibly describe as simple charisma, or perhaps an odd sort of friendliness.
It's kind of endearing, because in the middle of Vega, all of these major factions looking to deceive OL into allying with them while planning to stab him in the back...and this guy seems to be genuinely dependable and easy to understand.