Seven

Seven, or Judith is a member of Holofernes and was a host of the 18th May Evaluation and the 1st June Evaluation.

During the first evaluation, "Judith" played the part of tormentor of One. This matched with the Biblical story in which Judith beheaded Holofernes.

They were a host of the third evaluation too.

Curiously, Seven's mask is the only mask that does not bear the symbol of Holofernes. This may represent the Biblical Judith executing Holofernes, meaning Seven is more distant from the group than the rest.