Riku is a very stern and persistent teacher, he is very hot-headed and is sometimes calm and laid-back. He's mostly seen grading papers and reading a book. He has a wife and he's 28 years old. Riku is 6'4 in height and he has mint green hair, blue eyes and pale skin, also wearing glasses. He is dominant and is only rude to the troublemakers. He often has a serious or deadpan expression. He has a soft spot for shy students. He loves coffee and cats. He rarely ever smiles and he's stubborn.