My votes would be in between, Buck, Valk, or Hibana.
Buck: He's probably the one out of the list that's the most difficult to pick up and master because it almost requires you to have map knowledge to fully unlock his potential. He can really turn the tide of any round by destroying the floor under site and make the defenders move off their spots. The recoil patterns for his guns are (for me) more difficult to manage than the others on this list, but he's worth the time to pick up and learn. I'd suggest running his C8 with a Holo or ACOG.
Valkyrie: Unlike Buck, her MPX is a laser, even though the damage isn't the greatest. Again, you can pull some crazy galaxy brain plays if you place her cams in the right places. She's someone I want to start playing more of, just due to how good she can be in the right hands.
Hibana: I was a Hibana main before moving to PC. She's a Hard Breacher who can get hatches, reinforced walls and Mira's Mirrors from a distance...
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