Year of Birth: 1993 Real Name: Xeno Houston Wingfield Age: 25 (at time of revival) Height: 180cm Weight: 69kg Blood Type: A Birthday: October 1st Pre-Petrification: NASA Researcher Country of Origin: USA Preferred Type: Rational people Favorite Food: Cheeseburgers A scientist formerly with NASA. He became Senku Ishigami's indirect mentor in science after being the only one interested enough to reply to the "spam"—actually a barrage of scientific questions—that a young Senku sent out to the world. A genius who skipped grades to enter university, he harbors deep frustration toward "fools who wave the flags of ethics and politics to obstruct human progress," such as the elderly scientists who disregarded his ideals. He has been known to hint at dangerous ideologies like world conquest even in casual conversation with colleagues. He loves to describe things as "elegant" when moved, and his catchphrase is "Science is elegant." While he possesses a dangerous mindset born from a society riddled with conflicting interests, he maintains a sincere attitude toward science. He has the magnanimity to treat anyone—even children or subordinates—as equals, provided they are serious about science and progress.

Year of Birth: 1993 Birthday: September 1st Age: 25 (at time of revival) Height: 180cm Weight: 72kg Blood Type: B Pre-Petrification: Military Officer Favorite Food: Burritos A former military officer (Air Force) who served as a commander in the US Special Forces. He is a childhood friend of Dr. Xeno and was revived by the same nitric acid. Having known Xeno for a long time, he is called "Stan" by him. Xeno trusts him implicitly, saying, "If Stan says he can do it, he will," and indeed, he executes his duties perfectly. In short, he is a "cheat code" for endurance and marksmanship. His shooting skills honed in the Special Forces and his patience—staying on standby for hours or days with only water while sniping—are extraordinary; he waited until Luna discovered Senku. In terms of combat ability, he is on par with Tsukasa or Hyoga, or perhaps even superior given his advantage in range with firearms. He is also a highly skilled pilot; upon their first meeting, he pursued the group with a fighter jet and machine guns until the engine knocked due to Kirisame's acetylene gas. His equipment changed between the early days and after his revival: initially, he used a large revolver developed by Xeno, a twin-barrel heavy machine gun, a sniper rifle, and an assault rifle. After revival, he uses a large revolver and net gun grenades.

A girl. Very energetic. Birthday: July 7th Weight: 45kg Height: 164cm Currently serving in the Navy. She is highly skilled and currently holds the rank of Vice Commander. She is Guest's best friend and acts as their right hand.