Suruga proved to be a great partner for L in the film, since he obeys everything he wants or needs. He also shows concern for Maki Nikaido as he was with her while she was in hospital. In the novel, he is far more skeptical of L when he first meets him. He sometimes can't help but show his utter confusion and shock when it comes to L's strange actions, but he is very respectful. Overtime, however, he grows more comfortable around L, often calling him a pervert for putting surveillance cameras in Kimiko Kujo's room. He is very sarcastic and extremely flippant. He also has a crush on Kimiko Kujo.