This is the page for the former Good School Master,
Rhian was the Good identical twin brother of Rafal, Since they were twins it can be presumed that he too had white hair and bright 'glacier' blue eyes. 200 years before Sophie and Agatha's fairytale, he was killed by his own brother, Rafal, in the Great War.
The Ever Never Handbook
"Neither of the proper names of the Good School Master or the Evil School Master was ever known, though in my dealings with the latter, I can attest to hearing the Evil School Master - now known as Rafal - casually refer to his own brother as 'Rhian'. Whether that was the Good brother's name or merely a slip of the tongue, we'll never know."
At the mural, it is shown that he and Rafal looked very similar and shared the same hair color : White. Near the end, Rhian's ghost appeared after Rafal accidentally killed Sophie. He then possessed Professor Sader's body and defeated him.
When Sophie asks Rafal for the name of his brother, Rafal angrily replies, asking how that will help her to get to know him.Quests for Glory
Sophie confirms that Professor Sader told her that the Good twin’s name was indeed Rhian