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  1. Explanation Suiseiseki's Verbal Tic. Even though this is a fairly common speech pattern in lots of characters it became highly associated with her. It's not so much the word itself that's peculiar to Suiseiseki, but how she pronounces it: "desuuh" as opposed to the usual "dess".
  2. Explanation With Invasion Squid Girl getting an anime adaptation, Ika Musume's verbal tic became just as popular as desu for a short time.