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Monster characters: ages, heights & birthdays

The 50 most popular Monster characters, with how old and how tall each one is, their birthday and who voices them.
characters
50
characters
Youngest
19-23, (30's in Another Monster)
Johan Liebert
Oldest
28-37
Kenzou Tenma

Every character at a glance

CharacterAgeHeightBirthdayJapanese voice
Johan Liebert19-23, (30's in Another Monster)–April 7 AriesNozomu Sasaki
Kenzou Tenma28-37–January 2 CapricornHidenobu Kiuchi
Wolfgang Grimmer–––Hideyuki Tanaka
Heinrich Runge–––Tsutomu Isobe
Anna Liebert19-23, (30's in Another Monster)–April 7 AriesMamiko Noto
Eva Heinemann–––Mami Koyama
Dieter–––Junko Takeuchi
Martin Reest–––Shuuichi Ikeda
Julius Reichwein–––Ichirou Nagai
Franz Bonaparta–––Nachi Nozawa
Richard Braun––January 25 AquariusHiroshi Arikawa
Rudy-Ulrich Gillen–––Takayuki Sugou
Roberto–––Nobuyuki Katsube
Jan Suk–––Hisayoshi Suganuma
Otto Heckel–––Yoshito Yasuhara
Lotte Frank–––Kyouko Hikami
Fritz Vardemann–––Ryuusuke Oobayashi
Karl Neumann–––Tomokazu Seki
Hans Georg Schuwald–––Michio Hazama
Rosso–––Banjou Ginga
Jacob Maurer–––Yousuke Akimoto
Milan Kolacsh–––Akio Ootsuka
Helenka Novakova–––Atsuko Tanaka
Viera ČernÑ–––Houko Kuwashima
Akanbou–––Kazuo Kumakura
JaromΓ­r Lipský–––Hiroaki Hirata
Petr Čapek–––Nobuo Tanaka
Helmut Wolf–––Kouichi Kitamura
Christof Sievernich–––Masashi Hironaka
Adolf Junkers–––Takehiro Murozono
Dr. Becker–––Yasuyoshi Hara
Peter JΓΌrgens–––Rikiya Koyama
Wim Knaup–––Akiko Yajima
Milosz–––Mari Mashiba
Blue Sophie–––Kazuko Yanaga
Petra–––Ikuko Tani
Michael MΓΌller–––Yuuji Mikimoto
Herbert Knaup–––Eiji Hanawa
Turkojin Shoufu–––Youko Soumi
Gustav Milch–––Wataru Takagi
Udo Heinemann–––Masaru Ikeda
Hartmann–––Masaaki Yajima
Joushi–––Shirou Saitou
Heinz–––Mitsuru Miyamoto
Mikhail Ivanovich Petrov–––Chikao Ootsuka
Gunther Milch–––Shigeru Chiba
Gross–––Kinryuu Arimoto
Karl Brandt–––Tomohiro Nishimura
Max Steindorf–––Kiyonobu Suzuki
Elna–––Naoko Kouda

Ages and heights as listed on AniList; where a character grows up during the story, height is the latest one listed. Updated 2026-10-31.

Monster birthdays through the year

Monster overviewFull cast & voice actorsπŸ‘€ Most popular characters

Monster characters FAQ

Who is the youngest character in Monster?

Johan Liebert, listed as 19-23, (30's in Another Monster).

How old are the main Monster characters?

Johan Liebert is 19-23, (30's in Another Monster), Kenzou Tenma is 28-37, Anna Liebert is 19-23, (30's in Another Monster).

When are the Monster characters' birthdays?

Kenzou Tenma: January 2; Richard Braun: January 25; Johan Liebert: April 7; Anna Liebert: April 7.