ランビュール＝ダヌンツィオ

A former commoner given a knighthood for saving the king's life with his medicine.
Despite being an aristocrat in name, he has no interest in high society and spends his days cooped up in his room making potions.
His backfiring experiments and the constant chemical smell eminating from his room cause the heroine to often go and scold him, though this has brought them closer together.