Kingdom Hearts usually does the same as do a lot of Japanese tokusatsu tv shows where they bring in old characters for an anthology type episode / series (Kamen Rider Decade for example). (novacrystallis.com)
Super Differences Between Japan and the US From Astro Boy to Ultraman, Sailor Moon to One - Punch Man, the super-powered characters of manga, anime, and live - action tokusatsu TV shows wear costumes and fight bad guys, but how do they differ from their U.S. counterparts, and how do they reflect differences in U.S. and Japanese societies, values, and politics? (comics212.net)