Blue Diamond (voiced by Lisa Hannigan) is a former antagonist in Steven Universe.
- The Justice Guardians first see Blue Diamond in Jeffrey, Jaden, Hiccup & Friends meet Steven Universe - Steven's Dream.
- Blue Diamond thinks Hiccup is cute, but Hiccup doesn't like her, similar to Chowder saying, "I'm not your boyfriend!!!". But after Hiccup Left Homeworld, she feels like he left her and wants revenge on him. After the events of Reunited however, this may change.
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