Yuzuriha is a kind individual who tries to aid her friends and strangers alike in whatever ways she can. She usually uses her extensive crafting skills to help Senku carry out his inventions. While not explicitly stated, she seems to return Taiju's feelings, but is waiting for him to make his official confession. She seems quiet and, while not overly shy, is usually reserved. She tends to get nervous in dangerous or unpredictable situations, but knows to keep her mind at the task at hand.

Kind, hard working  

He is a violent but very kind, thoughtful, and polite man outside of his pessimistic ideals towards humanity. 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 narrow views of humanity. 

Strongest High Schooler

Gen is selfish and somewhat full of himself and his abilities, taking pride in his status as a mentalist, along with his knowledge of the human psyche. As a mentalist, he is deeply perceptive 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. His favorite drink is cola. 

Mentalist

Chrome is a highly energetic person with a lot of passion and curiosity. He is genuinely interested in science, although at first, he only knows it as sorcery. He is confident in his intellect, enough so to go toe to toe with Senku despite getting destroyed in a battle of wits. Chrome has a deep love of science, though he admits his expertise and knowledge lies mainly in exploration, particularly pertaining to rocks and minerals and gathering them. In addition, he is naturally inquisitive.

Energetic inquisitive 

She's a caring, inquisitive individual with a talent for with a talent for being stealthy. She seems to be a little shy, mostly because people saw her as weird for wearing a watermelon over her head. As a kid, she's curious and enjoys exploring. Possibly due to her lonely childhood being ostracized for wearing a watermelon helmet and lack of coordination due to her near-sightedness, she's quick to make friends and she's very friendly and kind. Suika is near sighted. 

Shy near sighted child

Xeno is brilliant when it comes to science. He likes to give lectures on the various scientific endeavors he's involved in. Xeno would often state the word "Elegant", when something amazes him. Xeno has proven to be condescending, he once stated in the case that he was sent back to the Stone Age that he will rule as a dictator over all those he saw as beneath him. He is a scientist at NASA

Condescending scientist 

He's enthusiastic about performing even small tasks and a diligent worker. He is very determined when something is important to him. He tends to yell loudly and is enthusiastic regardless of the task so long as he proves useful. He is persistent and determined. In addition, he tends to easily trust others and believe in the good of others. Taiju has a crush on Yuzuriha and tries to protect her whenever possible. Taiju isn’t very smart.

Outgoing friendly 

His overconfidence doesn’t cloud his judgment, as he is often backed up by a vast knowledge of science. He never belittles those who are less knowledgeable than him. Rather, he encourages and inspires everyone to do better. He believes that there is nothing science cannot explain. He seems to be apathetic towards romance. He is the adoptive son of the astronaut Byakuya. Senku isn’t strong physically and will easily lose a fight. He’s an only child 

Logical scientific 

Kohaku is a kind young woman, caring deeply for her older sister Ruri. This care extends to her comrades, and anyone she's loyal to. Other than her sister, she is particularly dedicated to Suika, playing for her the role of an older sister herself. While she cares so deeply for her friends and family that she would be willing to sacrifice herself for them, she is extremely cautious or even threatening with people she doesn't trust. Kohaku excels at fighting, hunting, and general survival skills.

Fighter

From what is seen about Stanley, he appears to be a "shoot first, ask later"-type of person. Owing to his past as a soldier, Stanley is very observant of his opponents. He will also get frustrated if he fails in a way, suggesting that he is a perfectionist. Although he respects the military code, not only is he capable of murder, but also an indiscriminate, systematic elimination of anyone who opposes his military objective.

Blunt, perfectionist soldier 

Kaseki is an honest old man who is prideful in his work and skill as an artisan. Unassuming unless provoked, he displays boundless energy when excited about his work. As one of the oldest members of the Kingdom of Science, Kaseki is relatively wise. He often imparts wisdom on the other members, and is unafraid to admit his own shortcomings. A genius craftsman, Kaseki picks up techniques with little effort.