All-Star Battle R/Koichi Hirose

"A new Echoes! (「新しいエコーズ」)"

Koichi Hirose (広瀬 康一) was confirmed to return for during the game's initial announcement trailer.

His moveset is fundamentally the same as his from, 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 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.

Gameplay
Koichi has 900 health and uses the Stand (スタンド) Battle Style, fighting foes with Echoes. During a fight, he can use various moves from his appearance in Diamond is Unbreakable.

Dialogue
Outside of, Koichi has unique dialogue for both his match entrances and victories when facing certain characters.

All-Star Battle Mode
All missions in starring Koichi as either the Player or Enemy, in order of appearance.

Music
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！？), and can be unlocked in-game by winning with a Dramatic Finish in 's Koichi vs Normal Battle.

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.

1.4.0

 * Standing Middle Attack [Stand On]
 * Extended reach.
 * Increased damage.
 * 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

 * Backdash
 * Fixed Koichi's collision box 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.
 * 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.