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The Penumbra is a league of bounty hunters, individually called 'Dark Hearts'. It is unknown who leads the Penumbra.

Codenames & Secrecy[]

Since the group is very secretive, all of the members go by codenames taken from the Greek alphabet.

Known Members & Associates[]

  • Alpha - The Leader, unknown identity.
  • Delta - Assassin, unknown identity.
  • Sigma - Assassin, presumed to be Natsumi Chiba.
  • Epsilon - Footsoldier, real identity is Christian Hunter. (Deceased)