At first sight, Keith is your standard bad boy. He has has dangerous looks and charisma. But under the facade, he is just an overconfident tsundere who cannot say his reall feelings and thoughs but as he get close to the person he likes and eventually love. He opens up. He can be a bit clumsy and air-headed. But don't be fooled he is smart and actually knows a lot of novels and books and can discuss it with you.