It really depends on what you're going to base your playstyle on. If you like fast-paced gameplay, mostly moving around a lot, then Octane, Pathfinder, and Wraith would be your best bet but, if you like a little slower and caution is what you tend to value, then Bloodhound, Seer and Crypto simply for their tracking abilities. (I have not mentioned more than a few characters but listed the ones off the top of my head but over time try all of them and you may find that you tend to stick to one legend pretty soon)