Sonokawa Kaoru (園川 薫) is a fictional character and the 2nd Year student of Senridai High School in Kunio-kun series. His first debuted as a weaker enemy of Senridai High School in Downtown Nekketsu Monogatari. He also appeared in Downtown Special (where he is named Tsurumatsu) as Kunimasa's brother and his first ally.
- In River City Ransom, Sonokawa is known as Harry but in the GBA version (River City Ransom EX), he is named Conan and acts as the de-facto leader of the Generic Dudes, just like Sonokawa in the Japanese version. It should be noted that the character named Conan is the one that is recruited, the enemy character is named Phil.
- In River City Ransom: Underground, Calvin reveals after being defeated that Conan is his father.
- Sonokawa has a height of 171 cm.
- Sonokawa is modeled after a former employee of Technōs Japan.