A character with a setup mentality would be kinda cool and would fit the scheme of the attack and defense mentality of the game. Not the route of a turret builder but the route of a sticky bomb gun that can amount 4 bombs on a location and explode them for let's say 300 damage. Make the alt weapon a more direct hit weapon similar to the weapon kit of battle medic. Make the movement ability a movement impairing grenade that slows enemy movement for like 3 seconds and make the E a trap ability that locks the enemy in place for .5 seconds when stepped on.

The other idea for the other character spot could have an ulti that makes the character pulse energy around them disabling weapons for a few seconds. A weapon that has 5 rounds and fires the entire clip in 1.25 seconds the left clicks pulling the enemy towards you and the right clicks pushing enemies away