All-Star Battle R/Parallel World Diego

"THE WORLD... it's Me Time now. (オレだけの時間だぜ)"

Parallel World Diego (並行世界から来たディエゴ), along with THE WORLD, was confirmed for as the fourth paid DLC character on May 31, 2023. He is slated for release on June 16, 2023, or June 14 for season pass owners. Like the first three paid DLC characters, he is included in the game's first season pass, and consequently the Digital Deluxe Edition and Ultimate Edition as well.

As in, Parallel Diego's name is localized as "Alternate World Diego" in the English localization of All-Star Battle R. Furthermore, THE WORLD's name is fully capitalized, differentiating it from 's version of The World.

His moveset is similar to that of his appearance, with modifications made and new aspects added to better fit in with All-Star Battle R's different gameplay style.

As the voice actor for Parallel World Diego, among other iterations of Dio Brando, since Eyes of Heaven, Takehito Koyasu reprises his role in All-Star Battle R as well. As with the majority of the game's roster, voice lines for Parallel World Diego were either added or re-recorded.

Gameplay
Parallel World Diego has 920 health and uses the both the Mounted (騎乗) and Stand (スタンド) Battle Styles, fighting foes with Silver Bullet and THE WORLD. During a fight, he can use several different attacks that were featured in Steel Ball Run. Unlike most other characters that use the Stand Battle Style, Parallel World Diego cannot manually summon and dismiss his Stand; instead, the Stand remains active as long as the user is dismounted, and appears instantaneously for any attacks that utilize it while the user is mounted.

Three parts of the Holy Corpse will slowly appear scattered across the stage when Parallel World Diego is a combatant. He can pick up these pieces to receive blessings that boost his performance in combat. If Parallel World Diego is pitted against, , , , or another Parallel World Diego, both players will have to fight over the three Corpse Parts, as only one set will appear.

Special Interactions

 * When hit by 's Heart Heat Attack, Parallel World Diego's face contorts in pain, referencing his expression as he says his final desperate words.
 * When hit by 's "It's an illusion." skill, Parallel World Diego bends over and crosses his arms, as he does when forcing himself upon Lucy Steel.

Dialogue
Outside of, Parallel World Diego has unique interaction dialogue for both his match entrances and victories when facing certain characters. Notably, new dialogue was not recorded for and, and they lack unique victory voice lines as well.

Music
Parallel World Diego's theme is Me Time (オレだけの時間だぜ), and and is automatically unlocked when purchasing Parallel World Diego's DLC.

Its name is a reference to some of the first words he says to Johnny Joestar when he finally reveals himself in Chapter 90 of Steel Ball Run.