Jump Force Ad Seemingly Reveals Jotaro Kujo, Dragon Quest Anime Hero As Playable Characters - Game Informer

They haven't been officially revealed, but it seems they're part of the cast.

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Dragon Quest's Dai confirmed for Jump Force

Two New Jump Force Characters Revealed Including Jotaro Kujo From JoJo's Bizarre Adventure

Jump Force - Game Informer

Jump Force ☆ Jotaro Kujo - JoJo's Bizarre Encyclopedia

Jump Force Advertisement May Have Accidentally Revealed Dai and Jotaro As Playable Characters

Jump Force - Dai and Naruto Characters Reveal Trailer

Game Informer Features

Jump Force - JOTARO KUJO & DAI CONFIRMED! JoJo's Bizarre Characters CONFIRMED!

10 Characters That Need to Be in the Jump Force Roster

Jump Force' Leak Reveals Jotaro From 'JoJo' and Dai From 'Dragon Quest