There should be a move called Guard. Basically it's like when trion users use shield but it covers your whole body with trion shields, It also enhances speed, strength, by making your guard move with you. Like using Guard to cover your body and make it propels the ground like when your walking on the ground but it gives it a drive to increase strength and speed. Also it obviously increases defense. Lead Bullets won't negates it but it will break a piece of it. You can do layers of guard, it will make it harder to move unless you have a high amount of trion left. I'm not really smart enough to make a suggestion but this seems pretty good and not much detailed.
New Side Effect is called Reflex, basically, fast reflex, but if I had the side effect I would be able to dodge, have good movement, and block any attacks including Lightning(sniper) shots.
You can combine these two things, Guard and Reflex Side Effect. Make a faint guard that you can barely see covering your body, if a lightning(sniper) shoots you, you automatically block it with shield or guard. The character with this side effect should ALWAYS be on guard, with Guard, He/She would react to any harm they think might happen or happen. You can make this ability however you want but has my concept.