There are more than forty different characters that appear in Wadanohara and the Great Blue Sea at least once. While many of them have stories that tie into the events of the game, some characters have stories that are never mentioned in-game; Deep-Sea Prisoner has many characters of their creation, and many of their characters appear in more than one of their works. 

Most likely, with the exception of Tsuribari, none of the characters in Wadanohara and the Great Blue are human, the majority of them being fish-type people. 

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