The Heavy Sniper has a huge hitbox, lots of health, and a comically massive sniper rifle. He is also slow.
Primary ability: Can deploy/construct a sniper tower anywhere with enough space.
Secondary ability: Sniper Rifle can pierce through bodies, with no limit.
That means that he can snipe from places that you wouldn’t typically expect. (And over some walls/obstacles that you wouldn’t normally expect.)
The tower also might provide some shortcuts for other players…either by jumping from the top, or wall jumping off the side of it.
The sniper tower can be destroyed, which would cause the occupant to take fall damage.
The main problem with this idea is that it might break the map design in some areas.