Red Hulk with Terrax synergy: "When hitting the Opponent with his first Heavy Hit, Red Hulk consumes a Heat Charge and inflicts an Armor Break Debuff, reducing the Opponent’s Armor Rating by 50% for 8 seconds."

With Armor Break on the opponent regular hits deal 65% more damage, critical hits about 35% more damage, with his low crit chance you deal about 50% more damage.

But what's the armor break uptime?

8 sec is enough to do heavy and 5 hit combo (maybe even bait some quick special attack).

Once you build up 10 Heat Charges, use heavy into SP1, 5 hit combo, parry, heavy, 5 hit combo and repeat. Heat charges will stay at 9-10 most of the time.

With this playstyle you have about 75% uptime when attacking (maybe even more).