He is brown and white Koga with mohawk on his head.
Like Toshimitsu, Tsukikage is extremely loyal and devoted to Tesshin as he sees him as the Koga Clan's heir. He also show extreme bravery when defending Tesshin from Monsoon's claws.
Tsukikage is never shown in real detail but accompanies Toshimitsu to give a message to Weed.
Tsukikage had to jump to the oldest, Toshimitsu and Samu with waterfall to Matheus conquered Koga. They survived except for Samu, but remained hidden. Later, they came to help Orion and his friends fight against Matheus's troops. Ninja Dogs went to Orion by, but vowed not to acquire their home back. Later Tsukikage and Toshimitsu to Ogasawara Gennai losing Kenshin down the tree and subsequently to release Shiro by Kurohabaki Masamune.
Tsukikage is among the group of ninja dogs who are given orders to lead the females and children away from the battle when Monsoon and his kin attack Ou. When Akame is far enough away, Toshimitsu, Tsukikage and the Elder turn back and attack Monsoon to buy the remaining dogs some time. All three are critically injured and placed in a makeshift prison.
Many days later, Tsukikage and the rest of the dogs are rescued by Mole and his group. Barely able to walk due to injuries and being cramped in the prison for so long. Shortly after, Tsukikage and other Ou army are resting in the grass during a storm. After The Koga Elder's death, Tsukikage and Toshimitsu reminded Tesshin that they were ordered to remain in that place, but Tesshin says that as long as they are here, they can not kill Monsoon and will not be safe. Tesshin arrives on the battlefield and tries to attack Monsoon. Tsukikage runs in to protect him and leaps into Monsoon's claws, causing Tesshin to fall out of harms way while he takes the attack. Tsukikage is thrown off and dies from his injuries shortly after.