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: This paper, available on ResearchGate, examines gender transitioning in anime and argues that some subgenres may reinforce binary gender concepts rather than being purely progressive.

: Found on Medium, this article discusses how shows like Hourou Musuko (Wandering Son) provide sensitive, nuanced looks at transitioning and gender expression.

Here are several reputable papers and articles covering these themes: Academic & Scholarly Papers she male anime

: Published by the Illinois Open Publishing Network, this article analyzes works like Stop!! Hibari-Kun! and No Bra to understand the appeal of gender-ambiguous characters to both male and trans-feminine readers.

: A detailed piece from The Artifice that breaks down characters who identify as women despite being misgendered by others, such as Lily Hoshikawa from Zombieland Saga . : This paper, available on ResearchGate, examines gender

While the specific phrasing you used is often associated with adult or derogatory slang, there are several high-quality academic and analytical papers that explore the representation of characters in anime from a scholarly perspective.

: An exploration on Sabukaru Online of how Japanese media allows for a wider range of character archetypes and "gender spicing" compared to Western media. Important Terminological Note Hibari-Kun

: This capstone project from CSU Monterey Bay uses Queer Theory to analyze how diverse identities are depicted in both Japanese and American animation. In-Depth Critical Analysis