Asagiri appears to be an average high school-aged male, close to Senku in height. He has blonde hair, although the left half of it, as well as his fringe, is blue. His eyes are baggy and his scar from de-petrification running down his left eye in an angled line.
He wears an overcoat over a yukata and lacks proper footwear.
Asagiri is somewhat full of himself and his abilities, taking pride in his status as a magician and a mentalist/psychologist, along with his knowledge of the human psyche. He is outwardly stoic, staying calm even when at spearpoint during his entrance in Ishigami Village. However, this facade seems easily broken through, as seen at his shock when Senku addresses him by name. Despite this, he is revealed to be extremely paranoid (though rightfully so), hiding multiple bags of blood in his clothes in the event he is attacked. He has shown signs of perversion, considering sticking by Tsukasa for the purpose of having a harem and hitting on Kohaku. Regardless, Gen is rather quirky and can often be seen speaking in Pig Latin. He tends to be lazy, self absorbed and perverted. He also shows reluctance in participating in the manual labor involved in Senku's experiments (though given how arduous the labor is it is understandable). In addition, as stated by Kohaku in his introduction, he is perfectly capable of lying without a hint of stress or change in expression.
While not nearly as intelligent in terms of science compared to Senku, he proves to be his equal and one of his most vital allies due to his ability to understand the human psyche and manipulate people through lies in contrast to Senku's more honest nature. He uses his abilities to promote cooperation and enthusiasm, motivate allies, conduct negotiations and outsmart enemies. He tends to shift between acting as a ditzy airhead when it suits him (such as to avoid work or going into battle) and an intelligent manipulator. he is confident and is shown to have nerves of steel even in the face of death.
He is a proud turncoat, openly offering to lie to Tsukasa about Senku's death when he sees his kiln. Gen favors being on the "winning side", although he is also easily swayed by Senku promising him something that appeals to his personal interest. Despite this, he later admits to Senku that he was most likely already won over by Senku's intelligence and ability to move mankind forward. He proves to be loyal to Senku and uses his abilities to help further Senku's plans usually by manipulating people such as promising Minami a special present to get her to relinquish the last bit of depetrification potion she had to revive Francois and similarly tricking Ryusei into paying a ridiculous amount of money to board the hot air balloon (though they needed him to board due to his excellent piloting skills).
He shows a surprisingly strong will and level of endurance, being able to survive a death attack from Magma with proper preparation and still go to the Empire of Might gravely injured to report Senku's death. He was also barely able to keep up with Francois walking to the Ishigami village two days straight (a rather difficult feat without food, water or shoes).
He is capable of genuine kindness, at one point creating a telescope as a surprise birthday present for Senku. He also seems to get along decently well with Suika, a child. He seems to not hold grudges, as he is able to work with Magma and manipulate him without fear, despite Magma having once attempted to murder him.
On a side note, he has frequently stated his favorite food is cola and that he cannot handle alcohol.
Gen Asagiri was a famous magician making a TV special prior to being encased in stone thousands of years prior to the events of Dr. Stone. He once met with Tsukasa during an appearance on a psychological magic show.
Kingdom of Science Arc
Depetrified by Tsukasa to look for Senku, Asagiri was introduced as Tsukasa's spy, sent to find Senku and report back if he was dead. However, Senku's progress at creating iron prompted an offer to lie about it and allow Senku to fall under his radar once again. Gen stuck around Ishigami village for some time after this, commentating on Senku's attempts to conduct electricity and distracting Magma with magic tricks.
However, in his anger at the "sorcerer" in the village, Magma assaults Asagiri and impales him with his spear, Gen only surviving due to the bags of blood hidden under his clothes. In his condition, he asks Senku if he can make him soda, one of the things he misses from the past, and is put out of commission.
Village Games Arc
During Chrome's fight with Magma, Asagiri suddenly appears in the midst of the fight before distracting Magma with another trick, convincing him if he moves, his heart would burst; this allows Chrome to secure victory, Asagiri's assistance allowed through a loophole.
Asagiri is shown reporting back to Tsukasa, however lying about Senku's survival; before he left, Senku held up his end of the bargain, giving him his soda and causing Asagiri to defect to his side.
Vs. Hyoga Arc
He officially defects to the Science Kingdom after sabotaging Hyoga's spear.
He attempts to convince Empire of Might members to defect using a Lillian Weinberg impression.
Age of Exploration Arc
He and Senku scam Ryusui out of a lot of money.
As a mentalist, he is deeply intelligent and manipulative, having a large knowledge of the human psyche. He is capable of analyzing and understanding obscure messages or drawings with his great knowledge about the human mind.
He is capable of mimicking people's voices to the point of being indiscernible from the original.
He also makes for a very convincing female, with Kohaku sating his only flaw was that he was tall for a lady.
- Asagiri means Morning Mist
- Gen's name is composed of "gen" (ゲン gene) while his surname Asagiri is composed of "asagiri" (あさぎり morning mist; morning fog), to create Asagiri (Morning Mist).
- Similar to Senku's hair colour, Gen's hair colour has varied throughout the series. It appearing as blonde and blue (Chapter 66 Dr. Stone Character Poll), white and brown (Chapter 25 and 104 colour pages) and blonde and brown (Chapter 95 and 111 colour pages, Shonen Jump Issue 31 2019, and the Viz Shonen Jump Banner of July 2019). In the anime, his hair is white and black.
- Gen ranked 3rd in the 1st and 2nd Character Popularity Polls.
|Male||Taiju Oki • Senku Ishigami • Gen Asagiri • Chrome • Kaseki • Kinro • Ginro • Magma • Ryusui Nanami|
|Female||Yuzuriha Ogawa • Ruri • Kohaku • Suika • Nikki • Minami|
|Male||Byakuya Ishigami • Gen Asagiri • Hyoga • Senku Ishigami • Shamil Volkov • Taiju Oki • Tsukasa Shishio • Ukyo • Yakov Nikitin • Yo • Ryusui Nanami|
|Female||Connie Lee • Darya Nikitina • Homura • Lillian Weinberg • Nikki • Yuzuriha Ogawa • Minami • Mirai Shishio|