Shinnyo is a scruffy adult monk with a sharp tongue who frequently breaks religious precepts, a stark contrast to his neat and clever childhood self. His unkempt appearance matches his irreverent behavior, which includes frequenting brothels and bars while openly rejecting conventional monastic discipline, deliberately distancing himself from tradition.

He engages in activities like singing karaoke with a microphone while his lover, the blind woman Shinjo, and other adherents listen admiringly. Senior monks observe him with envy, highlighting his nonconformist lifestyle. A Chinese-style poem he authored became the basis for a theme song, further underscoring his rebellious persona.

His background involves a complex relationship with Shinjo and interactions with fellow monks representing orthodox practices. Shinnyo's development centers on his rejection of societal norms and religious conventions; he remains unrepentant about his choices.