Jax Briggs - Heavy Weapons

Jax Briggs has the highest toughness among the gold characters. He moves swiftly and has a great special attack 2. I wouldn't use special attack 1 because of the minigame (bubble) and the short distance it requires to be successful. Team him up with Kenshi - Balanced and Jacqui Briggs - High Tech to gain a starting bar of power and a quicker power generation to execute L.A.W. Blast (special attack 2) as many times as you can and a quick end of the battle is guaranteed.

Passive

Heavy Weapons: Toughness Boost, AoE Damage, Shield Break - +30% toughness for all Spec Ops teammates. L.A.W. Blast (special attack 2) deals damage to the entire enemy team and breaks shields.

Specials

Gotcha Beatdown - Grapple: Medium damage
L.A.W. Blast - Attack: High damage + Shield Break
Bring It - X-Ray Attack: Extreme damage + Power

Support

Gotcha - Bonus Attack in percentage for all Jax Briggs characters
Gym Rat - Bonus Health for all Jax Briggs characters
O.I.A. - Bonus Recovery for all Jax Briggs characters

Equipment

Cybernetic Arm

25-45% Toughness boost;
[JAX BRIGGS] 20-30% Chance to reflect 100% Special Attack damage when blocking;
25% Chance to reflect 100% basic attack damage when blocking. (Unlocks at fusion level X)

And here is a video review of Jax Briggs - Heavy Weapons: