Like every member of the Shirogane, Guy’s eyes and hair are silver which make him instantly recognizable around humans. However, unlike most of the Shirogane we meet, he also has delicate features and was turned into a soldier very early in his life, and he hasn’t aged much, which makes it easy to think he’s quite young despite being over 100 years old.

Because Guy is almost immortal, he has had the misfortune of seeing many of his loved ones die. He was also abandoned by his biological mother and later lost his adoptive mother in a fight against the Automata, which led to him swearing he’d destroy them all. Perhaps that’s why he has a very dark sense of humor which includes pretending to die, crying to his mother’s photo in the worst possible moments and, if needed, treating his

At first, he might look like if he doesn’t take things seriously or like he just trusts his luck when fighting. But there’s a reason why he’s known as the Shirogane who killed 200 Automata. No matter what situation he may find himself in, even if he has all but three of his fingers broken and is in a plane going down, Guy will have a backup plan to make sure he and his allies survive.

When Guy first meets Narumi, he tells the younger man that he would not stop until all Automata are dead and that’s his only mission. Later, we find out that’s not completely true; his loyalty lies with Eleanor, the only biological daughter of his adoptive mother Angelina, and Souji Saiga, Masaru’s grandfather, to the point that he betrayed the other shirogane just to keep their secrets. This is because he considers them family, which is the most important thing in the world to him.

If Guy promises you will die at his hands, start making your funeral arrangements. No matter how crazy it sounds, or how difficult it may be to fulfill, Guy takes all his promises quite seriously. For example, he promised Angelina that Eleanor would find happiness and from then on, he did everything in his power to give her a normal life. And he would’ve succeeded if it wasn’t for the interference of the man he knew as Sadayoshi Saiga.