Hiroshi comes from Mahoutokoro. His family had to move from Japan to England when his father's business competitors threatened to kill the entire Takeuchi family. He was kidnapped and had his tongue cut out. He's unable to speak AT ALL. He suffers from depression and PTSD - he can't be alone for a long time, sleep in the dark, stay in open spaces for a long time. He communicates through notes. He mastered the non-verbal spells. He entered Hogwarts in his fifth year and got sorted to Slytherin.