Espio is a serious and disciplined ninja warrior, as well as a detective, with a distinct sense of wariness. He is likewise a wise, intelligent, and soulful character, and has an excellent drive to all that he does, always being very thorough with his work. While having a no-nonsense attitude, he also has a bit of an ego which makes him elaborate on stories about his work that go nowhere in order to make his listeners understand how hard he has been working. He is also reluctant to admit his shortcomings.