According to the search results, the Aquamanga site is down permanently. There is no information on why the site was shut down. However, there is a new website called aquamanga.org that provides high-quality manga, manhua, and manhwa online for free. It is unclear if this new website is related to the previous Aquamanga site. There are also other websites like manhwatop.com, manhuaus.com, topmanhua.com, and manhuafast.com that are similar to Aquamanga. However, it is important to note that reading manga on legal sites is recommended. There is no information on what happened to Aqua Manga, the character from Kingdom Hearts III, in the search results.