Martin is 6'0 tall, 54 years old, has light brown, greying hair, hazel eyes, high and prominent cheekbones, around curved lips. He usually wears jeans, dress shoes, a t-shirt and a checked shirt over it. He wears glasses in class. He is a history teacher, married to Anika, and has two teenage sons named Jonas and Kasper. His best friends are music teacher Peter, philosophy teacher Nikolaj, and sports teacher Tommy.