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During battle, one of the NPC support characters (known as Crew in the game) may become a Hero, which causes the Kizuna Gauge of the support character who is a hero to fill up more easily. Maxing out this support character's Kizuna Level and filling their Kizuna Gauge, will unleash their Hero Power.
Each character (Playable & Support) have their own Hero Powers which produce different effects, such as causing a barrage (such as Fujitora causing a barrage of meteors, Sakazuki unleashing a barrage magma, or Garp throwing a barrage of Cannonballs) that deals out damage to every enemy on a stage, restoring health of allied units (Chopper & Sanji's hero power), reducing the enemy units attack power by intimidating them (Zoro and Luffy's Hero Power), or inspiring allied units increasing their combat effectiveness and attack strength.
However tough enemies can also unleash their Hero Power which causes a stunned Gauge to appear over their head and when the gauge reaches 0 the enemy will be stunned causing their Hero Power to end.