Yamami Tsurumisaki

Tsurumisaki openly despises Normals and compares them to garbage. His contempt is shared by Shoko Kamimine, another member of the Plus Six.

Like the other members of the group, he follows his introduction with the phrase "Let's try and get along," creating a sharp contrast between superficially friendly language and his disdain for ordinary people.

The Plus Six are described as personalities that stand apart even from other Abnormals, making them conceptual predecessors to the extreme mentality later associated with Class -13.

Tsurumisaki possesses an Abnormality involving superhuman body temperature. His body can operate at temperatures outside normal human limits, making temperature itself part of his extraordinary physiology.

The manga provides substantially less detail about the practical limits and applications of this Abnormality than it does for the principal Thirteen Party members.

Tsurumisaki later acquires the Style Machine, adding a language-based Style to his original Abnormal capabilities.

Tsurumisaki appears with the Plus Six during the deeper stages of the Flask Plan conflict. Maguro does not recognize any of the six, indicating that they joined the project after he left.

The group represents Abnormals whose personalities are considered unusually distorted even within Class 13. Their presence broadens the Flask Plan beyond the thirteen principal members encountered by the Student Council.

After the Flask Plan conflict, Tsurumisaki remains among the wider network of exceptional Hakoniwa students and later acquires Machine as part of the spread of Styles.

Shoko Kamimine is Tsurumisaki's fellow Plus Six member and shares his contempt for ordinary people.

Maguro Kurokami does not recognize Tsurumisaki or the other Plus Six members, establishing that they entered the Flask Plan after Maguro's departure.

Medaka Kurokami encounters the Plus Six during her campaign against the Flask Plan.

Oudo Miyakonojou and the other Thirteen Party members belong to the same Flask Plan structure in which Tsurumisaki serves as one of the Plus Six.