All-Star Battle R/Kosaku Kawajiri

""Luck" is on the side of Yoshikage Kira! (この吉良吉影に「運」は味方してくれているッ！)"

Kosaku Kawajiri (川尻 浩作) 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, Kosaku's Stand, Killer Queen, is localized as "Deadly Queen", carried on from its debut.

Replacing Kosaku's previous voice actor, Rikiya Koyama, is Toshiyuki Morikawa, 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 Kosaku were either added or re-recorded.

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

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

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

Music
Kosaku's theme is KILL A (ＫＩＬＬ・Ａ), and can be unlocked in-game by landing the "Can I ask your name?" throw in 's Kosaku vs  Extra Battle.

Its name is taken from Kosaku's actual name, Yoshikage Kira, as it's a romanization of "Kira" featured on the cover of Chapter 146 of Diamond is Unbreakable.

1.3.0

 * Health
 * Reduced health. (from 1000 to 900)
 * "I'll crush you!" special
 * Shortened timing that hitbox takes to disappear, matching the animation.
 * "This stone is a bomb!" skill
 * Trap changed to disappear when Stylish Guarded, but the explosion will still occur.
 * "The First Bomb" skill
 * Increased tracking during startup.

1.4.0

 * "I'll crush you!" special
 * Adjusted hitbox to fix situation where move wouldn't hit when opponent was against a wall.
 * "Bites the Dust" GHA
 * Fixed bug where damage scaling was reset when used against.

1.4.1

 * Crouching Heavy Attack [Stand Off]
 * Increased range.
 * Crouching Medium Attack [Stand On]
 * Reduced pushback on hit.
 * Crouching Heavy Attack [Stand On]
 * Increased range.
 * Jumping Medium Attack [Stand On]
 * Increased duration of attack.
 * Jumping Heavy Attack [Stand On]
 * Increased gap between first and second hit to improve usability in neutral.
 * "This stone is a bomb!" skill
 * Shortened recovery period.
 * "Air Bomb Cushion" skill
 * Increased pushback on hit.
 * If this move is Flash Canceled, Kosaku can move first, possibly creating an advantageous situation.
 * "Stray Cat's protecting me now!" HHA
 * Shortened recovery period.

1.5.0

 * "Stray Cat's protecting me now!" HHA
 * Increased the distance between Kosaku and the opponent after a successful activation.

2.0.0

 * Jumping Light Attack [Stand Off]
 * Increased size of hitbox.
 * Increased the amount of time the hitbox is active.
 * Jumping Light Attack [Stand On]
 * Increased speed of startup.
 * Decreased recovery time.
 * "Impact Ignition Bomb" skill ( and versions)
 * Increased speed of startup.
 * "Air Bomb Cushion!" skill
 * Added a darkening visual effect to make it more obvious when this move is activated.
 * "The First Bomb" skill
 * Fixed a bug where the version's hitbox disappeared prematurely. It now matches with the  version.