Kazuha Toyama

Kazuha lives in Osaka near Heiji and has quite a small part in Detective Conan, she is a good childhood friend of Heiji and usually appears whenever he’s around. Kazuha sees herself as an older sister type of person for Heiji even though she is only 1 year older than him (I think). She secretly harbors more personal feelings towards him but hasn’t realised it yet, the same relationship as Shinichi and Ran.
When Conan and Ran visited Osaka for the first time they also met Kazuha for the first time. When she met with Ran she assumed that she was actually Shinichi who Heiji is always talking about and she conversed with Ran in a cold and reserved attitude. At first, Kazuha was very hostile towards Ran discovering the relationship between Ran and Heiji but once she found out about Ran having Shinichi, she started to act more friendly and soon became one of Ran’s best friends.
It’s obvious that Heiji and Kazuha have a close friendship full of trust and caring even though they always seem to be arguing. She is, however, a very warm and kind person once you get to know her as did Ran.