..... is introduced in the first episode of the series as a student of Ashford Academy high school, where he-she is a member of its student council. A brilliant thinker who is quite talented at chess, he-she lives with his-her younger sister, Nunnally, with their maid, Sayoko Shinozaki, at a house situated within the compounds of Ashford Academy, where they are looked after by the Ashford family.
...... suggests that even though he-she eats only sweet foods, he-she remains underweight because the brain uses the most calories of any organ in the body. He-she also says that if he-she sits normally, his-her reasoning ability would drop 40%.
... seems to have an unstoppable appetite, a characteristic that is common to the Japanese archetype of the (at times simple-minded) young male hero/adventurer with a heart of gold; perhaps the hunger more so in ....'s case due to having an elastic stomach. ... is also another one of the several characters given the middle initial "D."
Devising a Human Transmutation Circle, amassing the elemental ingredients for an adult human body and offering their own blood as soul and biological data, the boys secretly initiated the Human Transmutation in their home. Unfortunately, the Human Transmutation resulted in a Rebound.