Yūichirō has medium length black hair which can be considered quite messy. He possesses sharp green eyes which fall under his thick eyebrows. His eyes are large compared to most other male characters in the series. At the beginning of the series, he is often shown wearing a typical Japanese school uniform with a white sleeved T-shirt beneath.
After joining the Imperial Demon Army, he wears the standard JIDA uniform which consists of a long-sleeved black coat with light green details including the shoulder epaulets which has a brown Sam Browne belt passing diagonally over his right shoulder and two rows of gold buttons on the front. Along with that, he wears a pair of white gloves and a white web belt with a gold waist-plate. He also wears the uniform trousers and black boots which go over the trouser's leggings. Yū keeps his sword on the left side of his hip. Sometimes he can be seen wearing the JIDA hat, and often wears the JIDA cape as well.
Sword of Kings Storyline
He is one of the 3 main protagonist of Sword of Kings Storyline. He is a member of the Multi-Universe Resistance, Shinoa Hīragi's squad in the Moon Demon Company and later a member of Alliance of Freedom. He, along with Scarlet, possesses the "Abyssal-Punisher" gene, which is relevant to the forbidden taboo. He is also the Shinoa's crush, as well the homo, Mikaela.
Yūichirō Amane was born in 2000. During his childhood, both of his parents screamed that he was a demon spawn. Yūichirō's father (and possibly his mother) tried to kill him. His father screamed that he had to kill Yuu now because of his Abyssal Punisher was dangerous or the world would be ruined. His mother went mad and committed suicide, and Yū's home went up in flames. 5 years later, the state of his hometown give him a home in foster care, however, the Balam Alliance invaded his home-universe (8nd reality) and his hometown was completely destroyed with all population dead or enslaved by the Sith Empire. However, Yuu managed to escape from the war and hid under the earth in a jungle.
Two years later, Yuu saw that there was a resistance that fought the Balam Alliance throughout the universe, the Resistance, was composed of trillions and trillions of civilian and military. Although the Resistance was losing the war, Yuu joined the Resistance to take revenge for his friends killed in the invasion of his hometown. Later, the Resistance was wiped out by Triggers Hell and DEM Empire, after that Yuu fled to a ghost town where where he thought suicide after he was nothing else to love or protect. However, before he could commit suicide, the Reality Council teleported him and all villains and heroes on reality to 12nd universe to make a alliance and defeat the Balam Alliance Empires. Yuu, then, regret for trying to commit suicide and joined the Alliance of Freedom and become a great friend of Scarlet Heartnet and Nagi Zahura. As he fought in a battle against the Sith Empire alongside Optimus Prime, Erza Scarlet, Akame and Finn the Human, Yuu saved a girl from being killed by a Sith Trooper, the girl was Shinoa Hiragi. Days later, Shinoa joined Alliance of Freedom and had a crush on Yuu since that day.