Who is Oshima?

Oshima is a librarian in his early 20s who works at Komura Memorial Library and grows close with Kafka. Oshima is generous to Kafka, and helps him out along the way, from helping him stay at the library to eventually allowing him to live in his cabin in the mountains. Oshima becomes a sort of mentor to Kafka, sharing with him his interest in classical music and Greek myths; he also offers advice and guidance about Kafka's situation. Oshima reveals that at birth his assigned gender was female, but he now identifies as a gay man.