Kazuha Tooyama

Heiji Hattori and Kazuha Toyama grew up together and are easily each other's best friend and mutual love interest. They have gone at the same school since they were in pre-school. Neither of them have been shown to have other close friendships outside of their relationships with Shinichi and Ran, though Heiji does have a rivalry with fellow kendo practitioner Okita. They often spend time together, and Kazuha typically comes along when Heiji visits the Mouri's or vice versa, and is usually getting caught up with Heiji in criminal investigations. Kazuha and Heiji both wear twin good-luck charms that Kazuha made with pieces of the handcuff chain that stuck them together temporarily as children. Kazuha and Heiji have both shown jealousy when the other appears interested in someone else, even though they're not officially in a romantic relationship. Although, all their Jr. High School and…