The enormously popular Tokyo Comic Con (at least when it was last held in-person at the end of 2019) has now sprouted a version for all the comic and celebrity fans of West Japan.
While Japan has manga and anime festivals, the emphasis is on the authors and artists. The western-style Comic Cons have a bigger emphasis on movie stars and of course western franchises—like Star Wars and the Marvel Universe. Nonetheless, one thing they have in common is a love of cosplay, so expect lots of dress up—likely with a focus on western movie characters rather than Japanese ones.
While the Tokyo event happens in early Winter, the Osaka version is penciled in for early Summer at Intex Osaka.To prevent the spread of COVID-19, many events have been canceled. Always check official sites before heading to an event.