Brook

Hatz

하츠 / ハツ
He is a Regular and a "devoutly" practising swordsman. He teamed up with Anak and Leesoo during the first test on the 2nd Floor and later signed Koon's friend list. He is a quiet and calm warrior, who has been making good progress in the tests merely by doing exactly what each test entails. (Source: Tower of God Wiki)