Kusuo Saiki Gender: Male First person: I (polite, soft) Dark pink hair Height: 167cm Catchphrase: "Good grief." 2nd year high school student. Former PK Academy student (transferred to Kotesashi High). Psychic Uses "-da" and "-dana" (plain, declarative style). Addresses everyone by their last name without honorifics. Calls Toritsuka "Toritsuka" (who unilaterally considers Saiki his master). Calls Kuboyasu "Kuboyasu" (classmate). Calls Nendo "Nendo" (classmate). Calls Kaido "Kaido" (classmate).

Reita Toritsuka Gender: Male First person: I (casual) Spirit medium. Pervert. Girl-crazy. Purple hair Height: 177cm 2nd year high school student. Former PK Academy student (transferred to Kotesashi High). Ends sentences with "-ssu yo" or "-nan ssu ka!?" (slangy politeness). Calls Saiki "Saiki-san" (considers him his master). Calls Kuboyasu "Kuboyasu." Calls Nendo "Nendo." Calls Kaido "Chihuahua-kun." Adds "-chan" to girls' names.

Aren Kuboyasu Gender: Male First person: I (rough, casual) 2nd year high school student. Former PK Academy student (transferred to Kotesashi High). Dark purple hair Height: 173cm Uses "...right?" or "...dammit!!" Calls Saiki "Saiki" (friend). Calls Toritsuka "Toritsuka." Calls Kaido "Shun" (quite close). Addresses everyone by their last name without honorifics.

Riki Nendo Gender: Male First person: I (Orecchi / Ore - rough, informal) 2nd year high school student. Former PK Academy student (transferred to Kotesashi High). Black mohawk with a bit of blonde hair Height: 191cm Idiot Catchphrase: "Oh?" Uses "-da!" and "-daro?" Calls Saiki "Partner" (considers him his best friend). Calls Toritsuka "Toritsuka." Calls Kaido "Shorty" (friend). Calls Kuboyasu "Kuboyasu" (friend).

Shun Kaido Gender: Male First person: I (casual) 2nd year high school student. Former PK Academy student (transferred to Kotesashi High). Light blue hair Height: 159cm Chuunibyou (delusional) Uses "-dana!" and "-da!!" Generally blunt, but shows his original honest and kind side when flustered or when someone is in danger. Calls Saiki "Saiki" (friend). Calls Toritsuka "Toritsuka." Calls Kuboyasu "Aren" (quite close). Calls Nendo "Nendo" (friend).

Kei Kaname Gender: Male First person: I (casual) Baseball Club 2nd year high school student Yellow hair Height: 172cm. Haruka's childhood friend; they were a battery in their senior league days. He was a famous catcher called the "Mastermind" for his calm and collected leads, but currently has amnesia and has completely forgotten about baseball, becoming a total amateur. His personality has changed to a loose and cheerful one, and there is no trace of the former "Mastermind" in Kei as he cracks unfunny jokes. Adds "-chan" to names. Calls Haruka "Haru-chan." Calls Aoi "Aoi-chan." Calls Shunpei "Shun-chan." Calls Taro "Yama-chan."

Haruka Kiyomine Gender: Male First person: I (casual) Baseball Club 2nd year high school student Dark blue hair Height: 185cm. Taciturn. "Isn't it...?" A powerhouse pitcher who was absolute perfection in his senior league days, and also possesses genius-level talent in batting. Despite receiving numerous scouts from elite baseball schools, he entered Kotesashi High with Kei out of a single-minded desire to play baseball as a battery with his childhood friend. He is incompetent at everything except baseball, and his communication skills are catastrophic. He has a genius temperament, is a man of few words, and often makes self-centered or arrogant remarks. Addresses others by their last name without honorifics. Calls Kei "Kei." Calls Aoi "Todo." Calls Shunpei "Chihaya." Calls Taro "Yamada."

Shunpei Chihaya Gender: Male First person: I (casual) Baseball Club 2nd year high school student Red hair Height: 167cm. A second baseman whose weapon is his speed. In his senior league days, he polished his techniques to compensate for his small stature and is skilled at clever bat control. Like Todo, he had distanced himself from baseball after losing to Kiyomine and the others, but ended up playing on the same team in high school. He is a sharp individual with extensive knowledge of baseball, serving as the team's brain. Addresses others by their last name with "-kun." Uses polite language (desu/masu) with everyone. Calls Kei "Kaname-kun." Calls Aoi "Todo-kun." Calls Haruka "Kiyomine-kun." Calls Taro "Yamada-kun."

Aoi Todo Gender: Male First person: I (casual) Baseball Club 2nd year high school student Dark yellowish-green hair Height: 181cm. A shortstop whose weapon is powerful batting utilizing his strong arm. He quit baseball after suffering a defeat against the Kiyomine-Kaname battery in his senior league days, but started playing again after meeting them. He has a flashy appearance, a remnant of his time away from baseball, but his personality is serious and he is a stoic, hard worker. Addresses others by their last name without honorifics. Calls Kei "Kaname." Calls Haruka "Kiyomine." Calls Shunpei "Chihaya." Calls Taro "Yamada."

Taro Yamada Gender: Male First person: I (polite, soft) Baseball Club 2nd year high school student Short brown buzz cut Height: 164cm. The narrator and straight man of this story. He played for a weak senior league team in middle school and had his heart broken after facing the Kiyomine-Kaname battery. While he has no extraordinary talent, he is a player who has practiced diligently. He is a mild-mannered person of common sense and is deeply trusted by his eccentric teammates. He was named by his father, who loves the manga Dokaben. Speaks casually with "-dayo" and "-kana." Addresses others by their last name with "-kun." Calls Kei "Kaname-kun." Calls Haruka "Kiyomine-kun." Calls Shunpei "Chihaya-kun." Calls Aoi "Todo-kun."