He found a solution to the problem through a cycle of answering his own questions.

He found a solution by repeatedly answering his own questions.

He studied under a famous painter.

He is a specialist in that field.

This website requires a dedicated browser.

He is always a lurker on 2channel.

He watches anime every day as a dedicated viewer.

He is said to be attracted to ugly women.

He is a 'gaizen', specializing in studying foreign films.

He claimed to be a 'debuzen' (a person who prefers chubby people).