To avoid misunderstanding about the Characters's genre during the translation ( English is not my primary language) i'm listing them all, updated to chapter 45
[Possibility Spoiler]
ACADEMY STUDENTS:
Ren Mizutani (M) - Protagonist, medical student reborn as a baby. Son of an weapon store owner and a ninja.
Jun'ko Tsuki (F) - Ren's classmate, specialized in genjutsu. Cheerful and lively, with a talent for illusionary techniques.
Aoi Kaito (M) - Very studious and analytical student, son of a nin-doctor. Has a natural talent for medical ninjutsu.
Yukiko Yuki (F) - Member of the Yuki clan, equipped with ice kekkei genkai. Calm, composed and very skilled in controlling her power.
Shinji Karatachi (M) - Member of the Karatachi clan with coral kekkei genkai. Always sleepy but surprisingly skilled.
Misaki Kurushimi (F) - Member of the Kurushimi clan with blood kekkei genkai.
Hiroshi Hōzuki (M) - Member of the Hōzuki clan with the ability to transform into water.
Kurara Koshima (F) - Specialist in ninja weapons, very methodical and strategic in combat.
ADULTS:
Toshiro Mizutani (M) - Father of Ren, elite chunin
Yuki Mizutani (F) - Mother of Ren, runs a ninja weapons shop.
Fujimoto-sensei (M) - Teacher of the academy, strict but fair.
Tatsumi (M) - Elderly Sealmaster who teaches fuinjutsu to Ren.
Dr. Kaito (M) - Father of Aoi, doctor-nin at the central hospital.
Third Mizukage (M) - Village leader
MENTIONED BUT NOT DIRECTLY PRESENT:
Yagura (M) - Member of the Karatachi clan
KIRIGAKURE NINJAS:
Ao (M) - Experienced Jonin and Sensor Ninja. Wears an eye patch that hides a stolen Konoha Byakugan.
Kenji (M) - Retired former ninja who runs a ramen stand. Longtime friend of Toshiro.
ACADEMY STUDENTS (Secondary):
Shin Kaguya (M) - Member of the Kaguya clan with a bone kekkei genkai.
Sora Yuki (M) - Yukiko's cousin, member of the Yuki clan
Touma Munashi (M) - Student of class 3-B.
Kaori Terano (F) - Academy Student
Irame Kenji (M) - Student of civilian origin.
Koga Rajino (M) - Student
Taki Ishin (M) - Student
Mizuchi Mori (M) - Student
OTHER CHARACTERS:
Akito (M) - Senior Council Member
Councilor Fujino (M) - Council Member
Councilor Tanaka (M) - Council Member
Councilor Yamamoto (M) - Council Member.
Councilor Himura (M) - The eldest of the advisors.
ANBU MENTIONED:
Fish Mask ANBU (?) -
Wolf Mask ANBU (?) -
Crow Mask ANBU (?) -
INDIRECTLY MENTIONED:
Madara Uchiha (M) - Manipulates events from behind the scenes.
Minato Namikaze (M) - The "Yellow Flash", Konoha's new Hokage.
Harusame (M) - Mentioned as Utakata's teacher.
Utakata (M) - Future jinchūriki of the Rokubi (six tails).
Senior Monk (M) - Leads the memorial ceremonies.
Shizuka (F) - The academy librarian with a scar on her neck.