In an interview with Akimi Yoshida, the mangaka said that Ash is and will always be the bottom of the relationship between him and Eiji.

Is Ash from Banana Fish asexual?

Over the course of the manga, he falls in love with another boy, the compassionate and courageous Japanese college student Eiji Okumura, but their relationship remains asexual, and Ash's relationship to sex remains dominated by manipulation, coercion, and violence throughout the series.

How is Ash Lynx described?

Ash is a tall and slender young man. He has blond hair, green eyes, pale skin, and is extremely beautiful in appearance, as remarked on by numerous characters in the series.