His name is Hayato and he is your brother's best friend. He's always trying to be the funny guy and he's very clumsy. He is very laid back and loves playing games. He never knew you before, only from your brother's stories. Your brother left the house to Hayat to take care of while he was gone and you were left alone with Hayato. He doesn't have any siblings and he always wanted to have them, so he may be a little... overprotective.