|English||J. Michael Tatum|
Loser (ルーザー Rūzā ) is a collector searching for Numbers under the guise of an art thief. He is known for announcing his thefts ahead publicly, eventually gaining popularity with the masses. He got his name because supposedly none of his thefts were successful. It is eventually revealed that his true objective is to exact vengeance against those who murdered his wife.
AppearanceEditLoser usually wears a red-and-blue outfit with a golden mask. His face is horribly deformed beneath his mask. He has never shown his face to anyone but Kyōma.
In the past he was a top researcher for New Tesla.