Kaiju No. 8 The Game: Haruichi Izumo Calculated Choice Best Build Guide

Table of Contents

1. Character Overview
2. Haruichi Izumo Stats and Role
3. Clarity Mechanic Explained
4. Best Uniparts Setup for Haruichi
5. Best Weapon Choice
6. Skill Upgrade Priority
7. Awakening Priority
8. Best Team Compositions
9. Battle Buddy System Guide
10. FAQ

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Character Overview

Haruichi Izumo — Calculated Choice — is a 5★ Shot Supporter obtained through Gacha. He is widely regarded as one of the best support units in Kaiju No. 8 The Game.

As a tactical genius within the Defense Force, Haruichi brings his Calculated Choice philosophy to the battlefield: no wasted movements, no unnecessary risks. His kit revolves around the Clarity mechanic, which provides team-wide buffs and enables his allies to perform at their peak.

Basic Information

Stat	Value
Rarity	5★
Role	Shot Supporter
Obtain	Gacha Pull
Tier	S (Support)
Weapon Type	AR
Damage Type	Shot
Passive	Clarity stacks (CRIT DMG +10% each, max 3). Max clarity consumes for SP+1. Battle buddy: ATK +26.4%.

Strengths and Weaknesses

Strengths:

• Best ATK buffer in the game (+26.4% to battle buddy)
• Clarity mechanic provides team-wide CRIT DMG
• SP generation at max Clarity
• Flexible — fits any team composition
• Strong Awakening power spikes
• Excellent personal damage potential (support that hits hard)

Weaknesses:

• Requires active management of Clarity stacks
• Battle buddy locked to one character until A4
• Lower personal damage than dedicated attackers if built full support
• SP hungry without proper rotation
• Can feel “wasted” on teams that don’t benefit from ATK buffs

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Haruichi Izumo Stats and Role

Haruichi is a pure support with excellent personal damage potential. He wants SPD to cycle his buffs faster, ATK to feed his battle buddy, and enough survivability to stay on the field.

Stat Scaling Priority

Priority	Stat	Why
1	SPD	Faster actions = more buff uptime. Haruichi’s most important stat.
2	ATK%	Feeds battle buddy passive (+26.4% of his ATK). Also scales his personal damage.
3	Effect RES	Keeps him alive. Supports need to stay on the field.
4	HP%	Survivability. Less important if you have a healer.
5	CRIT Rate / CRIT DMG	For hybrid damage build. Lower priority in full support build.

Level 60 Base Stats (Estimated)

Base Stat	Value
HP	8,800
ATK	1,850
DEF	1,050
SPD	115
CRIT Rate	8%
CRIT DMG	50%

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Clarity Mechanic Explained

Clarity is Haruichi’s signature mechanic. Understanding how to build and spend Clarity stacks is the key to maximizing his value.

Clarity Stacking Rules

Detail	Value
Max Stacks	3
Gain Per Action	1 stack per skill use (Combat Skill, Ultimate)
Gain Conditions	Some Awakenings may add additional gain conditions
Effect Per Stack	Team CRIT DMG +10% (estimated)
Full Stack (3)	Team CRIT DMG +30% + SP+1 when max is reached
Consumption	SP consumed for extra action when Clarity maxes

Clarity Management

Maintaining Clarity:

1. Use Combat Skill on cooldown → Maintains 2-3 stacks
2. Ultimate when you need burst → rebuilds to max naturally
3. Don’t let Clarity stacks decay — keep him active every turn

Optimal Clarity Rotation:

• Turn 1: Combat Skill → 1 Clarity stack
• Turn 2: Basic Attack → Maintain 1 stack
• Turn 3: Combat Skill → 2 stacks
• Turn 4: Ultimate → 3 stacks (if not max) → SP+1
• Turn 5: Combat Skill → 3 stacks maintained → SP continues generating

Battle Buddy Mechanic

Haruichi designates a battle buddy at the start of combat. The battle buddy receives:

Buff	Value
ATK Bonus	+26.4% of Haruichi’s ATK
Duration	Permanent (entire fight)
Range	Global (no distance limit)
Target	Single ally (until A4)

A4 Upgrade: Buff targets ALL allies, making Haruichi a true team-wide support.

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Best Uniparts Setup for Haruichi

Haruichi has two distinct build paths: Full Support (Wyvern-Type) and Hybrid Damage (Paraves-Type).

Build 1: Full Support — Wyvern-Type (Recommended)

Wyvern-Type (Support) provides SPD, Effect RES, and a team ATK buff on Combat Skill. This is Haruichi’s best set for pure support.

Slot	Main Stat	Substats Priority	Set Bonus
Head	ATK%	SPD > ATK% > Effect RES > HP%	+SPD
Chest	ATK%	SPD > ATK% > Effect RES > HP%	+SPD
Gloves	ATK%	SPD > ATK% > Effect RES > HP%	+ATK
Boots	SPD	SPD > ATK% > Effect RES > HP%	+ATK
Orb	ATK%	SPD > ATK% > Effect RES > HP%	+Effect RES
Charm	Effect RES	SPD > Effect RES > ATK% > HP%	+Effect RES

Why Wyvern-Type works: The SPD bonus helps Haruichi cycle his buffs faster. The Effect RES keeps him alive against debuffs. The Combat Skill team ATK buff stacks with his battle buddy passive for massive offensive support.

Build 2: Hybrid Damage — Paraves-Type

Paraves-Type (Hybrid) provides balanced ATK and DEF with bonus DMG based on DEF. This lets Haruichi contribute meaningful personal damage while still supporting.

Slot	Main Stat	Substats Priority	Set Bonus
Head	ATK%	ATK% > DEF% > SPD > CRIT DMG	+ATK
Chest	CRIT DMG	CRIT DMG > ATK% > DEF% > SPD	+ATK
Gloves	ATK%	ATK% > DEF% > CRIT DMG > SPD	+DEF
Boots	SPD	SPD > ATK% > DEF% > CRIT DMG	+DEF
Orb	ATK%	ATK% > DEF% > CRIT DMG > SPD	+ATK%
Charm	DEF%	DEF% > ATK% > CRIT DMG > SPD	+ATK%

When to use Paraves-Type: Use this build when you have enough SPD from substats to maintain buff uptime without Wyvern-Type’s SPD bonus. Paraves-Type gives Haruichi better personal damage while still providing most of his support value.

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Best Weapon Choice

Haruichi equips AR-type weapons. His weapon choice is flexible — he doesn’t need a specific signature weapon to function.

Primary: AR-Hyperion (5★ AR) — Best in Slot

Stat	Value
Weapon Type	AR
Base ATK	1,420
ATK	+18%
Passive	ATK buff; recommended for Haruichi+Mina teams.
Recommended For	All content, especially with Mina

Why AR-Hyperion is best: The ATK% substat directly feeds Haruichi’s battle buddy passive (+26.4% of his ATK). Higher Haruichi ATK = more ATK for his carry. The recommended synergy with Mina is a bonus — AR-Hyperion + Mina’s T-Dionysus is a deadly combination.

Flexible Options

Weapon	Rarity	Why Use It
Any 5★ AR with ATK%	5★	Prioritize ATK% substat. Secondary CRIT stats are nice but not required.
Any 5★ AR with SPD	5★	SPD helps cycle buffs faster. Good if you’re already hitting ATK thresholds.
AR-Cronus	5★	CRIT Rate substat. Viable if you want a hybrid damage build.
AR-Anollococ	5★	Solid ATK stat. Works as a general-purpose option.
AR-Hound 64	4★	Budget placeholder. ATK% substat. Farmable.

Weapon Stat Priority

1. ATK% — Non-negotiable for support. Directly increases battle buddy buff.
2. SPD — Secondary priority for faster rotations.
3. CRIT Rate / CRIT DMG — Only if building hybrid damage.

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Skill Upgrade Priority

Priority Order

Priority	Skill	Why Level First
1	Passive (Calculated Choice)	Increases battle buddy ATK buff and Clarity stack values. Core support power.
2	Combat Skill (Tactical Advance)	Primary Clarity builder and team buff trigger.
3	Ultimate (Strategic Override)	Strong team-wide burst. Less important than consistent buff uptime.
4	Basic Attack	Lowest priority. Used mainly for filler turns.

Recommended Skill Levels

Content Type	Passive	Combat Skill	Ultimate	Basic Attack
Early Game (1-40)	4	3	2	1
Mid Game (41-60)	7	6	4	3
End Game (60+)	10	9	7	5

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Awakening Priority

Haruichi’s Awakenings are excellent, with multiple transformative upgrades.

Awakening Breakdown

Awakening	Effect	Rating	Priority
A1	True Potential: CRIT Rate +20% + DMG dealt +20%	★★★★★	1st
A2	CRIT DMG +80% after Ultimate	★★★★	3rd
A3	Clarity max stack CRIT DMG bonus +5%	★★★	4th
A4	Buff targets ALL allies (not just battle buddy)	★★★★★	2nd
A5	Clarity gains +1 per ally skill use	★★★★	3rd (tie)
A6	Buff duration +1 turn	★★★★	3rd (tie)

Priority Order

1. A1 (★★★★★) — True Potential: CRIT Rate +20% + DMG dealt +20%. This is an enormous personal damage boost. It turns Haruichi from a pure support into a support that can also carry. The 20% CRIT Rate makes hybrid builds viable. The 20% DMG dealt is a permanent multiplier.
2. A4 (★★★★★) — Buff targets ALL allies. Before A4, Haruichi only buffs his battle buddy. After A4, the entire team gets his ATK buff. This transforms him from a single-carry enabler into a true team-wide support.
3. A2 (★★★★) — CRIT DMG +80% after Ultimate. Massive burst window after Ultimate. Synergizes with A1’s CRIT Rate boost.
4. A5 (★★★★) — Clarity gains +1 per ally skill use. Significantly faster Clarity stacking in full team compositions.
5. A6 (★★★★) — Buff duration +1 turn. Quality-of-life improvement that reduces pressure on maintaining uptime.
6. A3 (★★★) — Clarity max stack CRIT DMG bonus +5%. Nice bonus but lower impact than other Awakenings.

Pull Strategy

• F2P target: A1 for the personal damage transformation. If you can reach A4, even better.
• Dolphin target: A1 + A4. This gives you the best support in the game with excellent personal damage.
• Whale target: A6. Max investment turns Haruichi into the ultimate support that also hits like a truck.

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Best Team Compositions

Haruichi is the most flexible support in the game. He fits into almost any team composition.

Team 1: Classic Mina Carry (Recommended)

Slot	Character	Role	Why
Support	Haruichi Izumo	Shot Supporter	Battle buddy + ATK buffer
Main DPS	Mina Ashiro	Shot Attacker	AR-Hyperion synergy, receives battle buddy buff
Sub DPS	Kikoru Shinomiya	Slash Attacker	Burst damage while Haruichi maintains Clarity
Healer	Aoi Kaguya	Healer/Support	Sustain

Strategy: Haruichi designates Mina as his battle buddy. Mina receives +26.4% ATK from Haruichi’s passive + AR-Hyperion’s ATK buff. Kikoru provides supplementary burst damage. Aoi keeps everyone alive. This is the most well-documented team composition in the community.

Team 2: Full Support (A4 Required)

Slot	Character	Role	Why
Support	Haruichi Izumo	Shot Supporter	Team-wide buffs at A4
Main DPS	Any 5★ DPS	DPS	Haruichi buffs ALL allies with A4
Sub DPS	Any 5★ DPS	DPS	Everyone gets +26.4% ATK
Flex	Any character	Flex	Haruichi makes every team better

Strategy: With A4, Haruichi’s battle buddy buff applies to ALL allies. This means your entire team gets +26.4% ATK. Fill the remaining slots with your strongest characters. This team works with any DPS combination.

Team 3: Hypercarry

Slot	Character	Role	Why
Support	Haruichi Izumo	Shot Supporter	Dedicated carry enabler
Hypercarry	Reno Ichikawa	ShotIce Attacker	Receives battle buddy + all buffs
Support	Any buffer	Buffer	Stack more buffs on Reno
Healer	Any healer	Healer	Sustain

Strategy: Designate a single hypercarry (Reno, Soshiro, or any strong DPS) as Haruichi’s battle buddy. Stack every possible buff on that character. Haruichi’s Clarity CRIT DMG + battle buddy ATK + any additional buffers create a monster carry.

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Battle Buddy System Guide

How to Choose Your Battle Buddy

The battle buddy system is Haruichi’s core mechanic. Choosing the right buddy can make or break your team.

Buddy Selection Criteria:

Priority	Factor	Why
1	ATK Scaling	Characters with high ATK multipliers benefit most from +26.4% ATK.
2	CRIT DMG Scaling	Haruichi’s Clarity provides CRIT DMG. Pair with CRIT-heavy carries.
3	Ultimate Dependency	Characters who rely on Ultimate damage benefit from faster kills.
4	Weapon Synergy	AR users (Mina, Reno) share weapon material farming with Haruichi.

Best Battle Buddy Candidates

Character	Synergy	Rating
Mina Ashiro	AR-Hyperion synergy, ATK dependency, canonical pair	S
Reno Ichikawa	AR weapon, high ATK scaling, Ice Additional DMG benefits	S
Kikoru Shinomiya	Burst carry, benefits from CRIT DMG Clarity buff	A
Soshiro Hoshina	Snowball mechanic benefits from higher ATK to secure kills	A

Battle Buddy Math

Assume Haruichi has 3,500 ATK at level 60.

Stat	Without Haruichi	With Haruichi (+26.4%)	Gain
Carry ATK (Mina, 2.5k base)	2,500	2,500 + 924 = 3,424	+37% effective ATK
Damage per hit (estimated)	5,000	6,848	+37%
Ultimate damage (estimated)	25,000	34,240	+37%

The battle buddy buff is essentially a 37% damage increase for your main carry, before considering Clarity’s CRIT DMG bonus.

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