Robin uses Tekkai by MSJPSakura on DeviantArt

Rokushiki, OnePiece Fanon Wiki

One Piece Gold - Rob Lucci's vivre card said that: The training required for the acquisition of rokushiki is akin to that used for acquiring haki. Akin = in the family Rokushiki

Could Mihawk or Shanks Know Rokushiki? : r/OnePiecePowerScaling

Jabra's Powers ONE PIECE GOLD

Rokushiki/Kami-e, OnePiece Fanon Wiki

Geppo, One Piece Role-Play Wiki

Tekkai, One Piece Wiki

Chapter Discussion - Rokushiki is based on Haki, Page 8

Kami-e, One Piece Role-Play Wiki

Tekkai One Piece on Make a GIF