Subaru Okiya is a college student currently residing at Shinichi Kudo's house. He has been able to deduce information about certain cases like a genius detective would. This, among other reasons (most noticeably Haibara's fear of him), has made it seem very likely that he is actually Bourbon, a new member of the Black Organisation.
Spoiler
In the end of episode 704 it was revealed that his true identity is Akai Shuuichi.
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