Unknown Princess

The Unknown Princess is a third-year student, who was a former Princess alongside Arisada two years prior the storyline of the series. Now he is one of Arisada's new assistants.

Background
He used to be a Princess alongside Shuya Arisada two years prior the storyline of the series. He has been abroad for a while, but he ended up coming back to Fujimori and became one of Arisada's new assistants after the previous ones graduated from the school.

Princess Princess Plus
Tooru asked him and his companion if they liked serving "pure evil", referring to Arisada. He happily says that he was away for a while, but it was nice to be back. The boys observe that they are just like their predecessors, with Yuujirou commenting they are the same "species" as Arisada.

Trivia

 * He's incredibly tall.