Guide

Koichi Hirose

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Last updated: August 11, 2026

Koichi Hirose

Special · Range 4

Rarity SSR

Fighting Style Special

Range 4

Overall Tier SS

Basic status (Lv.)

263.9K (Lv.1: 15.2K)

ATK

20.4K (Lv.1: 1281)

DEF

7010 (Lv.1: 424)

Smack

Applies Onomatopoeia to 1 ally in front at deployment. If no ally is in front or the unit is defeated, targets the ally with the highest Attack. At the end of the duration, deals damage equal to 400% of Koichi Hirose's Attack to all enemies within the area of Onomatopoeia, and Immobilizes them for 3 seconds.

2 Increases Onomatopoeia's damage per second to 220% of Attack and the final hit damage to 440% of Attack.

3 Increases Onomatopoeia's damage per second to 240% of Attack and the final hit damage to 480% of Attack.

4 Increases Onomatopoeia's damage per second to 260% of Attack and the final hit damage to 520% of Attack.

Onomatopoeia

Deals damage equal to 120% of Attack to all enemies within 2 tiles around the target. Applies 1 "Smack" Onomatopoeia words within 2 tiles. Enemies entering the 2-tile area around Smack are Immobilized for 3 seconds. Smack expires after Immobilizing an enemy. Smack placement prioritizes the direction of the enemy closest to Koichi Hirose. Cooldown: 14 seconds.

2 Reduces cooldown to 12 seconds. Increases damage to 160% of Attack.

3 Reduces cooldown to 10 seconds. Increases damage to 200% of Attack.

I Won't Forgive You!

Increases Attack and Max HP by 10%. Special Attack: Basic attacks from allies with Onomatopoeia have a 50% chance to deal additional damage equal to 60% of Koichi Hirose's Attack to all enemies within 1 tiles.

2 Increases attribute bonuses to 15%, Onomatopoeia trigger chance to 55%, and additional damage to 80% of Koichi Hirose's Attack.

3 Increases attribute bonuses to 20%, Onomatopoeia trigger chance to 60%, and additional damage to 100% of Koichi Hirose's Attack.

Reverb ACT 2

Ultimate grants 2 stacks of Effect Hit Up to the target ally. When an ally with Onomatopoeia is defeated, immediately triggers Onomatopoeia, dealing damage equal to 440% of Koichi Hirose's Attack to all enemies within 2 tiles.

2 Increases damage to 480% of Attack.

3 Increases damage to 520% of Attack.

Body-Penetrating Sound

When Onomatopoeia deals damage, has a 10% base chance to inflict 1 stack of Attack Down and Spirit Influence to the target hit.

2 Increases trigger chance to 20%.

3 Increases trigger chance to 30%.

Recommended Dramatic Scene

The Taste of a Lie

Special units lean on status effects, and this set gives their debuffs a chance to land an extra stack.

2-Piece:Attack +5%

4-Piece:Attack +5%. When applying a debuff to an enemy, there is a 20% chance to apply an additional stack.

Recommended Badges

Badge 1

Keicho Nijimura Badge

Only activates when equipped by a Ranged character. All attacks deal 2% more damage to debuffed enemies.

Badge 2

Koichi Hirose Badge

Only activates when equipped by a Ranged character. Casting any skill grants a stack of 1% skill damage bonus for 6 seconds, stacking up to 4 times.

Recommended Substats

Effect HitRanged DMGCrit Rate

Koichi is an SS SSR Special who turns allies into damage amplifiers via Onomatopoeia. Smack stamps a carry, Echoes ACT 2 buffs Effect Hit and revenge-blasts on ally death, and Body-Penetrating Sound adds Attack Down pressure. Special Attack procs from Onomatopoeia basics mean his value scales with whoever he buffs. Priority Special support-carry hybrid — build him when you have a strong attacker to stamp.

Koichi Hirose

Koichi Hirose

Basic status (Lv.)

Promotion Attributes

Recommended Dramatic Scene

Recommended Badges

Recommended Substats