Koichi Hirose (広瀬 康一, Hirose Kōichi) was confirmed to return for All-Star Battle R during the game's initial announcement trailer.[1]
His moveset is fundamentally the same as his from All-Star Battle, with a few tweaks being made to both balance the character and fit him into the overall gameplay tweaks that All-Star Battle R brought.
In the English localization of the game, Koichi's Stand, Echoes, is localized as "Reverb", carried on from its All-Star Battle debut.
Replacing Koichi's previous voice actor, Romi Park, is Yuki Kaji, who has voiced him since the Diamond is Unbreakable anime adaptation. Because of this, and like the majority of the game's roster, voicelines for Koichi were either added or re-recorded.
Koichi has 900 health and uses the Stand (スタンド, Sutando) Battle Style, fighting foes with Echoes. During a fight, he can use various moves from his appearance in Diamond is Unbreakable.
When hitting an aerial opponent, this attack no longer causes a soft knockdown, instead causing basic hitstun.
Style/Specials/Etc. [Stand Off] (スタイル/特殊技/その他)
Stop it!
+ ON GROUND
This command normal now causes a crumple instead of launching the opponent away. It is also now a High rather than a Middle. Furthermore, it executes faster now, making it slightly less reactable.
Skills [Stand Off] (コマンド技)
I'll never forgive you!
+ //ON GROUND
Echoes ACT1 now travels much farther than it did in All-Star Battle for the and variants. Also, on hit, it now launches the opponent. It also does significantly more damage. Additionally, the translation for the name of this skill is slightly different. Formally, it was "I won't forgive you!" in place of "I'll never forgive you!".
"Ah, tranquility, seeping into a rocky crag, a cicada's trill"
(When "I'll never forgive you!" hits) //ON GROUND
The input for this follow-up has changed. Previously it was + // in place of //. The translation for the name of this skill is also different. Formally, it was "Cicada's cry etched in stone" in place of ""Ah, tranquility, seeping into a rocky crag, a cicada's trill"".
Sizzle!
+ //ON GROUND
When ACT2 tosses its tail end, it tosses it up higher into the sky, changing its arc. It also travels faster, meaning that, even though it has an increased upward distance it has to travel, it will actually contact the opponent or ground earlier than it would in All-Star Battle. Additionally, the amount of damage it deals is much greater now and it increases as the strength of the attack button does instead of staying the same across variants.
Kaboom!
+ //ON GROUND
When this counter is successfully activated, the opponent is not flung nearly as far as they were in All-Star Battle. The damage dealt when successfully activated is significantly higher now though.
Boing!
+ //ON GROUND TRAP
Where ACT2 places the "boing" SFX now changes based on the attack button inputted instead of being placed at the same distance, no matter the variant.
Normals [Stand On] (通常技)
Standing Light Attack
ON GROUND
This attack now causes a soft knockdown when hitting jumping opponents.
Standing Medium Attack
ON GROUND
Echoes ACT3 moves out a significant distance now when it attacks. This attack also hits twice now instead of only once.
Standing Heavy Attack
ON GROUND
Echoes ACT3 flies forward a greater distance than it did in All-Star Battle.
Crouching Medium Attack
+ ON GROUND
Echoes ACT3 moves forward a greater distance than it did in All-Star Battle.
Crouching Heavy Attack
+ ON GROUND
Instead of causing a hard knockdown on hit, the opponent is now launched into the air, suffering a soft knockdown when they hit the ground. This allows Koichi to extend his combos naturally without any special conditions or costs.
Jumping Medium Attack
IN AIR OK
The hitbox of this attack has been extended outward, allowing for this attack to now hit grounded opponents. It also now launches opponents on hit and hits twice instead of only once.
Skills [Stand On] (コマンド技)
Hit them, ACT 3!
+ //ON GROUND
While ACT3's travel distance still increases with the strength of the attack button, ACT 3 travels a significantly shorter distance than it did in All-Star Battle for all variants. This results in the opponent not getting pushed as far away from Koichi now. All the variants also deal less hits, resulting in them also dealing less damage.
S-H-I-T
+ //ON GROUND WHEN DOWNED
Instead of pausing before barraging the opponent, ACT3 now continues its movement immediately once it rises into position. However, to keep the duration of the skill similar, ACT3 now punches and travels downward slower than it did in All-Star Battle. The variants also deal more hits now, with the number of hits increasing as the strength of the attack button inputted does. Additionally, Echoes does not travel all the way to the ground when it attacks, and while this doesn't affect typical gameplay, this means that this skill is no longer able to hit and slow down Yoshikage Kira's GHA, Sheer Heart Attack.
Wh-What is this wind?!
(While taking damage or guarding) + for 2 HH ON GROUND
The input for this skill has changed. Previously it was + // in place of + . This skill will no longer knock Koichi back, meaning it also no longer damages him. It also no longer damages the opponent either though. Furthermore, it now costs two stocks of Heart Heat rather than only a portion of a single stock. Additionally, the translation of the name of this skill has changed. Formally, it was "This air pressure!?" in place of "Wh-What is this wind?!".
Heart Heat Attack / Great Heat Attack (ＨＨＡ / ＧＨＡ)
Echoes ACT3: Freeze!
+ 2 ATK Buttons
ON GROUND
ACT3 delivers its barrage slower than it did in All-Star Battle.
Does this mean I've gotten stronger?!
+ 3 ATK Buttons or ON GROUND
The translation for the name of this GHA has changed. Previously it was "I'm really getting stronger?!" in place of "Does this mean I've gotten stronger?!".
General Changes
Koichi's run speed in User Mode has been reduced.
3 Freeze now prevents opponents from dodging and stylish guarding, making it a much more difficult effect to deal with. This is especially potent when his Assault Assist, which inflicts the effect, is paired with a character that has an Unblockable attack as it makes it impossible for the opponent to prevent the attack from hitting.
Medal List
Costumes & Tints
Costumes
Normal
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The player's health is decreased. The opponent's health continuously refills.
Secret Missions
1. Down your opponent: 1000 G 2. Land a Stylish Evade: Iggy Publicity Artwork 3. Land the "A 'nasty' habit" skill: Iggy's Theme 4. Win with a Great Heat Attack: Iggy Special Outfit A
Entrance Dialogue
Koichi: That's a Stand! Are you telling me a dog can be a Stand user?! Iggy: I'm on walkies, so get lost or I'll rip your leg off!
Victory Dialogue
Iggy: I can tell you're a dog lover, so I went easy on you.
Defeat Dialogue
Koichi: Wow, that was quite a shock! Maybe Police will develop a Stand next?
Koichi's theme is Does This Mean I've Gotten Stronger?! (ひょっとして成長したんですかァ！？, Hyottoshite Seichōshitan desu ka!?), and can be unlocked in-game by winning with a Dramatic Finish in All-Star Battle Mode's Koichi vs Yukako Yamagishi Normal Battle.
Koichi's Theme
Its name is in reference to Koichi saying the line "Does that mean I got stronger again?" in Chapter 93 of Diamond is Unbreakable in response to Echoes ACT 2 evolving into Echoes ACT 3.
An ally from Part 4: Diamond is Unbreakable. He is the user of the StandEchoes, and one of Josuke Higashikata's classmates. Timid and unreliable at first, he slowly earns the trust of his friends, and even some enemy Stand users form a one-sided friendship with him. Although initially annoyed at Yukako Yamagishi's love for him, he eventually reciprocates her feelings.
User of the Stand Reverb and one of Josuke Higashikata 4's classmates. Weak and unreliable at first, he slowly earns the trust of his friends, and even some enemy Stand users. Yukako Yamagishi's affections for him are eventually reciprocated.
Koichi Hirose's Stand. At first, it appears in the form of an egg, but while fighting Tamami Kobayashi, it breaks its shell to be born.[3] Echoes evolves with Koichi, initially taking an insectoid form and gradually becoming more human. ACT1 and ACT2's skills are sound-based, while ACT3 has the ability to make matter heavier. The different ACTs can be utilized depending on the situation.
Koichi Hirose's Stand, first revealing itself fighting Tamami. Reverb evolves with Koichi, initially taking an insectoid form and gradually becoming more human. Acts 1 and 2's skills are sound-based, while Act 3 makes the opponent heavier.
The cliffside where Koichi and Yukako fought. It became infamous due to an urban legend about a young woman who was bounced gently along the rocks with a "boyoyoing" while attempting suicide. Located in the northeastern part of Morioh.
The cliffside where Koichi and Yukako fought. It's famous for the urban legend about a young woman who jumped to her death, only to be bounced gently along the rocks below with a boing. Located in the northeastern part of Morioh Town.
Increased number of hits so it is easier to use in combos. (2 hits)
Crouching Heavy Attack [Stand On]
Increased duration of hitbox.
This move now knocks the opponent into the air instead of knocking them to the ground.
Increased amount of float.
Decreased recovery time.
Jumping Medium Attack [Stand On]
Increased number of hits so it is easier to use in combos. (2 hits)
Increased damage.
Jumping Heavy Attack [Stand On]
Increased duration of hitbox.
Increased damage.
"S-H-I-T" skill ( and versions)
Added ability to hit downed opponents.
1.6.0
Crouching Heavy Attack [Stand On]
Increased recovery time.
2.0.0
3 Freeze
When affected by 3 Freeze (put in a gravitated state), the opponent can no longer Dodge.
Backdash
Fixed Koichi's hurtbox so that it matches the animation rather than extending above where he visually is.
Throw
Increased recovery time.
Added ability to Flash Cancel the recovery when successful.
This makes it so while it is still possible to connect "S-H-I-T" after a throw, it can only be done at the cost of Heart Heat.
"Boing!" skill
Fixed a bug where if Koichi used this skill and then activated this trap himself while in Stand Mode, it would prevent him from dismissing Echoes.
"S-H-I-T" skill
Decreased the total duration of 3 Freeze applied by the last hit.
This change applies to the Assault Assist as well as this is the skill it uses.
"Echoes ACT 3: Freeze!" HHA
Fixed a bug where, if Echoes triggered a trap previously placed by the "Boing!" skill while Koichi was in Stand Mode, Koichi would continue performing this HHA.
IN AIR OK 
+ 
/
/
+ 
ON GROUND 
Taunt Lines
1500 G
Echoes Act 1 Reference Sketch
Buffs
Nerfs
Neutral
for 2 HH ON GROUND 
Normal Costume
Iggy's Theme
Iggy Special Outfit A
Koichi Color Tint C
