I'm no artist, but I've been kicking around the idea of a sniper class legend. There's a lot of emphasis on close range combat, but I feel that some of the open areas would be prime for a long range covering fire character. Especially with how many different sniper rifles are available in game.
Abilities would look something like:
Passive: Ability to lay prone
Tactical: Sensor or tripwire to alert teammates of incoming squads. The other potential would be some sort of mobility option to be able to climb for a vantage point.
Ult: Amped shots. Directional stationary "window" that can be deployed that amplifies damage 1.5x for rounds that pass thru. Similar to Titanfall. Incoming rounds thru this "window" are reduced .75x. Temporary.