Gagi and Guge

Gagi and Guge are a pair of twin brothers, and Ghouls that are members of Aogiri Tree. They are always seen in the presence of Naki and serve as his henchmen.

Appearance
The twins are extremely large and well-built. In the anime, they are seen with short dark hair, as apposed to the manga, where they are completely bald. They wear nearly identical white masks, with one smaller and one larger hole for the eyes, just like an emoticon of O-o and o-O. Both wear identical white suits, in imitation with their leader.

Personality
The twins seem to act as a single unit, without any distinctive traits that define them as individuals. Their speech is unusual, coming out garbled though Naki appears to understand them without issue. Both are deeply devoted to their leader, coming to his aid and attempting to comfort him when problems arise.

Past
At some point in the past, the twins were recruited by Naki and Yamori, becoming members of the fledgling gang that would eventually become the White Suits.

Raid of Kanou's Lab
The pair take part in the raid with Naki, fighting against and with Kaneki's group and against the CCG. One of them is almost stabbed by Akira Mado but Naki jumps in front of them and is wounded instead. They carry him to safety as the group retreats.

Post-20th Ward One-Eyed Owl Battle
They are seen playing on a see-saw with Naki.

Auction
They took part in the fight against the CCG with Naki and the rest of the White Suits. When Naki was wounded in battle with Akira, and surrounded by Investigators, they used their bodies to shield him from harm and sacrificed themselves to protect their "Big Brother". Afterwards, the surviving members of the gang rampaged to avenge them.

Naki
The twins are completely devoted to him, following him wherever he goes and carrying out his orders. They are loyal to the point of shielding him with their bodies from several Q-Bullets and the attacks of Investigators, not minding their own injuries. They call him 'Big Bro'.

Powers & Abilities
Neither brother has ever been seen using their kagune, but both are noted for their massive size and incredible strength. Their brute strength is sufficient to challenge powerful investigators such as Koutarou Amon.