Tsukasa Shishio

Tsukasa Shishio (獅子王司 Shishiō Tsukasa) is the main antagonist of the first 82 chapters of Dr. Stone. His goal is to thin out the human population to create a new world without modern technology, saying that adults and how humanity evolved caused them to become evil. Despite his claims that no threat would come after Senku and Taiju, which proved ironic, Tsukasa became one of the biggest obstacles to Senku's Kingdom of Science and restoring humanity as a whole in general. Tsukasa is a tall man that is estimated to be somewhere around 6 feet 8 inches in comparison to the cast of characters and Boichi's commentary that he's the tallest out of the cast. His hair mimics chestnut brown and reaches his lower back along with amber eyes. Also to keep in mind, Tsukasa has androgynous features that blend the combination of masculine and feminine characteristics into an ambiguous form. This can be explained below: In Japanese culture, Bihaku (美白) is a Japanese term meaning "beautifully white". Senku compares Tsukasa’s eggshell skin tone to a "white lily-flower" in the official Viz English translation[2] because Tsukasa's skin is just that pale.  It's intriguing to note that Senkuu compares Tsukasa to that of a lily flower despite Tsukasa being a male; if his features weren't so blurred between the sexes, then Senku should've addressed his similarity to something like a white seashell or etc. It's interesting to note that back in Chapter 4, Senku accused Tsukasa of flirting with him because Tsukasa complimented Senku's ingenuity-- though Senku compliments Tsukasa's eggshell skin tone and compares it to a flower even though Tsukasa's a guy himself. Tsukasa also has elongated dark eyelashes, hair, and his face is rather slender than to be compared as chiseled and defined.

Even though his body is rather muscular because he is an MMA/UFC global athlete, averaging to be around 225 lbs to compete in the Heavyweight Division, his features remain ambiguous. He also wears his lion coat draped around his shoulders post chapter 26 almost mimicking a woman wearing a fur coat and scenes that imply Tsukasa's effeminate characteristics further in the manga are captured. Whether this is intentional or sleight of hand by Boichi and Riichiro Inagaki, Tsukasa's androgyny currently remains a mystery. He has three stone markings; one across his face that cuts across his right eye, another etched deep into his left one from the corner of his eyelid all the way down across his nose and ends at the bottom of his jaw on the right, and the other being stretched across from his left shoulder over his chest and stopping at his upper abdomen. After years of MMA fighting, Tsukasa gained permanently swollen knuckles found on his index finger, middle finger, and ring finger. Before humanity was petrified, Tsukasa had unruly hair he’s been growing out since he was little. Post-petrification, he’s kept remnants of stone on the tips of his hair and has a shaved undercut with a slit at the sides, complimenting his stone markings across his eyes. His initial outfit starts off with a red yukata made from a lion’s remains he ended up killing to protect Senku and Taiju. He used its pelt as a coat that he wore around or draped across his shoulders. He wears no shoes. After chapter 78, he wears a cream pelt shirt with his torn yukata as a skirt. Tsukasa is essentially violent but extremely careful and aware of his actions. He is a very kind, thoughtful, and polite man outside of his pessimistic ideals towards humanity. He offers help in the beginning to Senku and Taiju after they revive him and becomes their hunter for food, using his skills as a prominent athlete to aid them. It’s revealed later that Tsukasa plans to purge humanity and thinks Senku will go along with him, but instead Senku rejects him. After this point, Tsukasa becomes fairly determined in carrying out his plans even to the point of leaving their group. He’s confessed to Senku that he doesn’t care about anyone but himself, though in the latter half of the story it’s revealed that Tsukasa loves his sister Mirai more than anything in the world and that is where his resilience comes from, so he can save her. He also reveals that Senku could’ve been his first friend pre-petrification as to which Senku agrees. From this angle, we can assume Tsukasa shuts himself off from others and only focuses on saving his sister. He’s naturally withdrawn outside of his goals. He tends to hate humans who control and manipulate others. By his actions, it is possible to assume that Tsukasa hates any hierarchy or practice of power. His goal is to create a society without technological advancement and he uses any means to achieve that objective; creating his own empire modeled on his twisted views of humanity.

Though to note, there are many points in the story that explore Tsukasa's psychotic behavior. One instance is when he first breaks a stone statue and has no remorse, continuing to crush more in his wake. He particularly goes after older adults and elderly people, but specifically leaves children alone. This can be related to his personal background and history of being assaulted and abused by those in authority. He also ends up taking Yuzuriha hostage in order to gain the Revival Formula. Tsukasa also by no means wants to resort to fighting or killing but will do so if he feels pressured or his vision for humanity is at stake. This is seen when he ended up killing Senku after sharing a tender moment of wishing they could've met 3,700 years later. When he was younger, Tsukasa was picking out seashells on the beach to make a necklace for his sister Mirai because she wanted to be a mermaid princess like The Little Mermaid. It is unclear whether Tsukasa refers to the Danish fairytale version by author Hans Anderson, the Japanese film based off of this story with the protagonist named Marina, or the animated Disney film The Little Mermaid with the protagonist being Ariel. While choosing seashells for Mirai, an old drunk fisherman came and beat Tsukasa to the point his face was unrecognizable. The fisherman justifies his assault behind him owning a fishing permit in the area and Tsukasa was trespassing. After this event, Tsukasa's sister became clinically brain dead, and required constant life support. From then on, Tsukasa somehow managed to train and find his way to the MMA so he could support his sister's life and defend himself by all means. He ends on becoming a well known MMA fighter nicknamed the "Strongest Highschool Primate" in the combat sport. He becomes so famous that even Taiju, who doesn't watch TV, knows who he is.