Dafu

Katsuya Tabuse (田伏克也) or Dafu (ダフ) is one of the original members of the Litchi Hikari Club, alongside Tamiya and Kaneda. He's extremely loyal to Tamiya.

He is appointed number five (Fünf) by Zera.

Bokura no Hikari Club
Dafu was part of the original three members of the Hikari Club. Even as Zera took over as their leader, he still remained loyal to Tamiya.

Litchi Hikari Club
He is the first one to show any signs of revelion against Zera. He rejects the idea of them kidnapping girls.

After Kanon is captured, Dafu sneaks one night in the basement and proceeds to touch her while masturbating. However, he is found by Niko and Zera, who sees this as a punishable act. He then orders Tamiya to execute Dafu for his offense.

Moments before being executed, he shows no remorse and tells Tamiya he doesn't mind him killing him, and is glad he even got to touch a girl before dying.