Senku Ishigami

Boichi designed Senku.

Riichiro Inagaki created Senku as an alternative of superheroes rarely explored in fiction as Senku does not possess any supernatural power. Inagaki thought about the average person. For the average person to accomplish something, he would need to keep working and build up towards whatever the goal is. He claims that he wondered "what's a cool way to portray that average person working hard for their goal?" To amplify that idea of not being able to do anything was the idea of petrification; Senku was created with the idea of being the embodiement of "working diligently by counting for a couple thousand years". Inagaki further wanted to make Senku as a unique character in the manga to the point the other characters are listed as "non-Senku" as he wanted to explore relationships where the cast develop a bond together.[2]

Originally, Senku was named Gaku as that kanji, 學, stands for "study". However, he felt it was too academic and changed to Senku (千空) as it meant "Thousand skies". Inagaki further claimed that Senku will never develop fantasy powers as it would contradict the realistic setting provided ever since the beginning.[3]

Inagaki professes to use a method of character creation that he refers to as "acting." Essentially, Inagaki often reuses set types of characters in new settings for his works, and in the case of Senku, he essentially reused the character of Agon from his previous serialization, Eyeshield 21. He professes that he likes the type of curt, no-nonsense character that both Agon and Senku embody. Since Agon in only showed that type of character's bad sides, and wanted to do the opposite for Dr. Stone. The scientific focus of the series means that Inagaki has to stick as closely to reality as possible which often needed research.[4] In order to make Senku look cool, Inagaki often asks Boichi to draw a certain background when Senku comes across with finding a new item like "Hydroelectric power plant acquired!!"[5]

In regards to the series' message, Inagaki wanted readers to understand Senku's "power" and his ambitions, using his knowledge of the past to make a stronger future. Artist Boichi said that he related to Senku in regards to the philosophies to life such based on how the artist went from writing in Korea to Japan based on his desires, seeing the manga as a competition to help manga artists in the same way Senku assists society through his skills.[2]

Voice actor Yūsuke Kobayashi mentioned that the intonation of the names were not really clear until they started recording. Kobayashi also voiced the series' mascot, Mecha Senku, who highly resembles the main character.[6] Before voicing him for the English dub, Aaron Dismuke watched the original Japanese episodes, to capture the feeling of the original work, finding it challenging to do. Dismuke further commented that Senku has a tendency to make expositions of creating items such as preparing meals to the point Senku is "all over the place".[7]

Anime director Shinya Iino said "least 50% or more is the character Senku, who's a very unique character." with praise given to Kobayashi's work. As a result, he found Dismuke's work challenging as he had to have the same appeal as Kobayashi. In regards to Senku's characterization, Iino was conflicted with how to modify his facial expressions for emotional scenes. He further compared Senku with Inagaki to the point Senku might be an author avatar of the manga author.[8]

Senku is a prodigy who excels in multiple fields of science, with a special love of astronomy and space exploration. In the series' beginning causes Senku and the entire population to be petrified for thousands of years. After awakening in the "Stone World", he sets to restore civilization by reinventing their lost technology and discovering a "cure" for the petrification. Though somewhat arrogant, he is actually very noble and kind-hearted as he considers science as a means to elevate all people and having unshakeable faith in his friends. Senku and Taiju prepare enough revival fluid to free one person from stone, with Taiju choosing Yuzuriha to be first subject. However, the recently revived Tsukasa reveals to Senku his intention to murder petrified adults to create a world free of corrupt adults, clashing with Senku's ideals of reviving everyone. As Senku relinquishes the recipe to save Yuzuriha and is given the choice of either abandoning science or dying, he recalls how he developed his love of science and became friends with Taiju. Refusing to abandon science, Senku prepares to die at Tsukasa's hands.

After faking his death to keep Tsukasa from hunting him, Senku befriends the residents of Ishigami Village and becomes their chief, finding out that he is a legend in the village's community at the same time thanks to the influence through one of the villagers' ancestors, who happens to be Senku's late adopted father Byakuya, one of the original petrification survivors. He meets sorcerer named Chrome who has come on his own Senku makes him his apprentice. Senku unveils the pile of tungsten for final preparation. After being crushed into a fine powder, it needs to be heated at an extremely high temperature for it to become usable. While Senku readies the tungsten powder, he charges Chrome and Kaseki to create a method of pinpoint high-temperature heating using everything they have learned since Senku's arrival in the village.

Tsukasa and Hyouga prepare for the upcoming attack on Ishigami Village. Senku discuss bringing more men from Tsukasa's Empire to their side. Following several battles, Senku demands a truce from Tsukasa in return for reviving his sister Mirai who Tsukasa learns is alive. Using the revival-fluid, Mirai is revived. Following Hyoga's defeat and Tsukasa entering cryosleep, Senku was able to get the remnants of the Empire of Might to merge with the Kingdom of Science where he leads the Five Wise Generals. Senku calls an assembly where he announces that they will find the secret of the petrification. He also reveals that they will construct a ship to explore the world.

• Senku Ishigami at Dr. Stone anime official website (in Japanese)