Roswaal Mathers

Mental age: 400+
The lord of the Roswaal Mansion and a descendant of the original Roswaal.

He comes across as an eccentric due to his flamboyant appearance and odd speaking style, the latter which he shares with his grandmother. However, he harbors a more calculating and reserved side with a sharp political mind and gaze that reads others quite well.

It is later revealed that he is in fact the original Roswaal, Roswaal A. Mathers, who has been possessing his descendants' bodies to meet his teacher Echidna again at any cost, even if that means sacrificing himself or those close to him.