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.