Pathfinder

@JDOGMcFUZZL I've done the math on the "Low Profile" "nerf" and trust me, it is a nerf in name only. 5% increased damage taken translates to at best a few hundredths of a second decrease in TTK, and at best 1 less bullet fired. On top of that the "nerf" was introduced as a way to try and add incentive to playing other characters rather than actually nerfing the core strengths of each of the characters.

Before the grappling hook nerf (in which it takes a hair longer to reach its target before you actually start grappling) Pathfinder could pretty much easily jump into dangerous situations and hop right out of reach with the grappling hook. You had to be quick to retaliate, or he'd basically get away scot-free. 

Lifeline gets to play much more aggressively than other characters due to her passive of using consumables faster. That being said, you do still have to know what you're doing in order to maximize her aggressive play style, but playing aggressively was pretty popular back when the "Low Profile" nerf came into effect. 

Wattson simply got the nerf because there was a lot of camping back on Kings Canyon. Locking off areas of access was invaluable on a relatively small map like KC, and high rank players would often camp in buildings waiting for the zone to push their enemies into unfavorable positions. 

Wraith got it cause, well, Wraith is and has been one of the strongest characters in the game due to hit box alone. Small hitbox + muzzle flash + unpredictable movement = an extremely difficult (but not impossible) target to track.