Twelfth Green

Twelfth Green is a member of the Twelfth Five along with Yomotsu Hirasaka (Twelfth Red), Twelfth Blue, Twelfth Yellow and Twelfth Pink. He is arguably the best character in the series.

Personality
Not much is known about him. He's a very mysterious character.

The Cult of the Sixth
Four other people dressed like Twelfth Green join him on the roof of Omekata Temple, the green eyes coloured in blue, yellow, red and pink. Together, the quintet does a dramatic The Super Sentai inspired entrance, complete with an explosion set off by one of the Yomotsu impersonators. The five, identifying themselves as the "Quintwelve", leap down before Yuki, Yuno and Tsubaki and all introduce themselves as Twelfth. Talking one after the other, the five explain one of them has swallowed Minene's bomb which will explode shortly, and the real diary user ate the bomb. Yomotsu points out to Yuki the sins of the Omekata cult, planning to commit suicide by blowing himself and Tsubaki to pieces, revealing his diary has a Dead End flag. The Twelfth Five charge at Yuki, shuffling around to make it trickier for the trio to stop them. Yuno quickly realises Yomotsu is blind, picking up a rock and throws it at a rail. The sound of the rock causes Yomotsu to cock his head to listen to it, giving him away. Yuno races through the Quintwelve and slashes Yomotsu's throat with an axe. After that, what happened to the Twelfth Five is as much of a mystery as Twelfth Green himself.

Trivia

 * His favourite colour is green.
 * Twelfth Pink probably has a crush on him because he is so awesome.
 * In the anime, he calls out his code name "Twelfth Green" with much more passion than the other members of the Twelfth Five.