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First appeared in Nova #1 in 1976 and was created by Marv Wolfman and John Buscema. Richard Rider is the first Marvel superhero to be known as Nova. He became Nova when he was chosen by Rhomann Dey of the Nova Corps to take his place in its ranks.
Nova (Marvel)
Superheroes
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What Superheroes or Supervillains should join the MCU