Kimball Cho is a former member of the CBI team, along with Teresa Lisbon, Patrick Jane, Wayne Rigsby and Grace Van Pelt. Although he is normally a very serious person who always follows cases "by the book" he also has a very dry sense of humor. He mainly acts as the interrogator, because he is very persuasive and an excellent listener. Apart from his girlfriend Summer Edgecombe in At First Blush he also had a very beautiful girlfriend, who appeared in episode Blood In, Blood Out, where we learn a lot about his past. He has unsuspected skills as a ladies' man which he displays in the episode Crimson Casanova. He's always careful with his money and is a bit superstitious, as we see in the episode Red Rum.