3 Deadly Hikari Builds, Boosting From Beyond - Octopath Traveler II
Elemental Build
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Support Skills: Of Equal Might, Boost-Start, A Step Ahead, Deal More Damage
Weapon: Thunder's Roar
Gear: Any 3 pieces of armor that increases E.ATK
Accessories: Alpione's Amulet, Finisher Claws
Works well with Conjure Abilities. Hikari also has access to several good elemental Learned Skills that can benefit from this.
Damage Hikari Build (Armsmaster)
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Support Skills: Boost-Start, A Step Ahead, Deal More Damage, (any support skill of choice)
Weapons: All Armsmaster weapon
Gear: Any 3 pieces of armor
Accessories: Alpione's Amulet, Finisher Claws
Deals a lot of damage at 1HP with Alpione's Amulet. You can switch the Armsmaster Class out for any other class that has a high Damage Dealing Skill.
Boost From Beyond Build
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Support Skills: Hang Tough, BP in Adversity, A Step Ahead, Deal More Damage
Weapons: Your Strongest Weapons
Gear: Any 3 pieces of armor
Accessories: Alpione's Amulet, Finisher Claws
Boost From Beyond gives your entire party 2BP, you then live on 1HP because of Hang Tough. Since you are near death, you now get 2 extra BP on Hikari due to BP in Adversity. From there, you can use your team to nuke the fight, or have a cleric cast the cleric divine on Hikari, to let him act again.
Latent Power Build:
Full Power, Boost Start, A Step Ahead, Deal More Damage
Equip your strongest weapon, and just spam your Latent power every fight.