Kastro

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Kastro is a prominent fighter in the Celestial Tower and apparently a celebrity, as he is constantly giving out autographs. He hangs out on the 200th floor of the Celestial Tower with the intent on building enough wins to become a Floor Master. His only loss was to Hisoka, so he trained rigorously to improve his nen. After accumulating nine wins (ten wins are needed to be a Floor Master), he challenges Hisoka to a rematch.Kastro's undoing was in the type of nen that he had chosen. Although he was born to the reinforcement nen type, Kastro's ability completely ignored his strengths and used materialization and manipulation. A reinforcement type's maximum ability in these fields is 60% at best, so Kastro would never be able to use his full potential.

Nen/Abilities
Nen type: Reinforcement Nen ability: Doppelganger