The headmaster of Otokojuku (男塾, Man's Private School?) and a former Navy Major General. He is a bull-headed kendo master teaching troubled youths to be warriors. A child prodigy who entered Tokyo University at a very young age with only a week's study. He fought bravely in World War II as an imperial soldier. This character is modeled after the Imperial Japanese Navy admiral Togo Heihachiro (東郷平八郎; The city of Edajima (江田島) was the site of the former Japanese Imperial Naval Academy; see ja:海軍兵学校). Whenever he's about to deliver the coup de grâce to his enemy, he shouts his famous one-liner: "I AM THE PRINCIPAL OF OTOKOJUKU, EDAJIMA HEIHACHI!!!" (わしが男塾塾長江田島平八である！！, Washi ga Otokojuku Jukuchō Edajima Heihachi de aru!!?). Any inquiry in regard to many of eccentric Otokojyuku rule or his decision is also answered by this one liner.  The character was famously cosplayed by Lee Teng-hui, former President of the Republic of China, Taiwan.  (Source: Wikipedia)

Otokojuku - a private school for juvenile delinquents that were previously expelled from normal schools. At this school, Japanese chivalry is taught through feudal and military fundamentals. Similar to an action film, the classes are overwhelmed by violence. Only those who survive it become true men. 
(Source: Anime News Network)

Non-anime roles:
~!Abobo in "Double Dragon" (Neo-Geo) (VG)
Andorf (Andross) in "Star Fox 64" (VG) (Japanese)
Ashuraman in "Kinnikuman Generations" (VG) (Japanese)
Ashuraman in "Kinnikuman Muscle Generations" (VG) (Japanese)
Ashuraman in "Kinnikuman Muscle Grand Prix 2" (VG) (Japanese)
Ashuraman in "Kinnikuman Muscle Grand Prix MAX" (VG) (Japanese)
Ashuraman in "Kinnikuman Muscle Grand Prix" (VG) (Japanese)
Baloo in "The Jungle Book" (Disney animated movie) (Japanese)
Baron Praxis in "Jak II Renegade" (VG) (Japanese)
Bass Armstrong in "Dead or Alive 2 Ultimate" (VG) (Japanese)
Bass Armstrong in "Dead or Alive 2" (VG) (Japanese)
Bass Armstrong in "Dead or Alive 3" (VG) (Japanese)
Bass Armstrong in "Dead or Alive" (VG) (Japanese)
Black Hole in "Kinnikuman Generations" (VG) (Japanese)
Black Hole in "Kinnikuman Muscle Generations" (VG) (Japanese)
Black Hole in "Kinnikuman Muscle Grand Prix 2" (VG) (Japanese)
Black Hole in "Kinnikuman Muscle Grand Prix MAX" (VG) (Japanese)
Borgan in "Lunar 2: Eternal Blue" (VG) (Japanese)
Burnov in "Double Dragon" (Neo-Geo) (VG)
Cobra Bubbles in "Lilo & Stitch" (Japanese)
Dai Maoh in "Super Dodge Ball" (Neo-Geo) (Japanese)
Demon Knight in "Dragon Quest" (drama audio)
Edge Master in "Soul Calibur" (VG)
Elvis in "WILD ARMS the Vth Vanguard" (VG) (Japanese)
General Pepper in "Star Fox 64" (VG) (Japanese)
Gilgamesh in "Final Fantasy XII" (VG)
Heihachi Mishima in "Death by Degrees" (VG) (Japanese)
Heihachi Mishima in "Namco X Capcom" (Japanese)
Heihachi Mishima in "Soul Calibur 2" (VG) (Japanese)
Heihachi Mishima in "Tekken 4" (VG) (Japanese)
Heihachi Mishima in "Tekken 5" (VG) (Japanese)
Hoslow in "Emerald Dragon" (Drama CD) (Japanese)
Illgoga in "Tobal No. 1" (VG) (Japanese)
Jack Mathers in "Time Crisis 4" (VG) (Japanese)
Jirado in "Astal" (Sega Saturn Game)
Lazarus in "Shining Tears" (VG) (Japanese)
Lord Zedd in "Mighty Morphin Power Rangers: The Movie" (live-action movie) (Japanese)
Master in "Xenosaga Episode II: Jenseits von Gut und Bose" (VG) (Japanese)
Mike Bison [Balrog] in "Street Fighter II Made Revenger" (drama audio) (Japanese)
Mr.Satan in "Dragon Ball Z Ultimate Battle 22" (VG) (Japanese)
Mr.Satan in "Dragon Ball Z: Budokai" (VG) (Japanese)
Mr.Satan in "Dragon Ball Z: Sparking!" (VG) (Japanese)
Orson Perrault in "Ace Combat 5: The Unsung War" (VG) (Japanese)
Pigma Dengar in "Star Fox 64" (VG) (Japanese)
Pigma Dengar in "Star Fox Assault" (VG) (Japanese)
Robin Mask in "Kinnikuman Muscle Grand Prix 2" (VG) (Japanese)
Robin Mask in "Kinnikuman Muscle Grand Prix MAX" (VG) (Japanese)
Robin Mask in "Kinnikuman Muscle Grand Prix" (VG) (Japanese)
Robin Mask in "Kinnikuman Nisei: New Generation Choujins vs. Legend Choujins" (VG) (Japanese)
Robin Mask/Barracuda in "Kinnikuman Generations" (VG) (Japanese)
Robin Mask/Barracuda in "Kinnikuman Muscle Generations" (VG) (Japanese)
Scott Dolph in "Metal Gear Solid 2: Sons of Liberty" (VG) (Japanese)
Shingen Takeda in "Samurai Warriors" (VG) (Japanese)
Shingen Takeda in "Samurai Warriors: Xtreme Legends" (VG) (Japanese)
Sigurd Sidmeyer in "Galaxy Angel Moonlit Lovers" (VG) (Japanese)
Taira no Kiyomori in "Genji: Dawn of the Samurai" (VG)(Japanese)
Uighur in "Hokuto no Ken: Seikimatsu kyûseishu densetsu" (VG)
Vargas in "Der Langrisser" (VG) (Japanese)
Volf in "Ninja Gaiden Sigma 2" (VG) (Japanese)
Volt Krueger in "The Bouncer" (VG) (Japanese)
VSSE Director in "Time Crisis 4" (VG) (Japanese)
WRO Fukuchou in "Dirge of Cerberus: Final Fantasy VII" (VG) (Japanese)
Yosemite Sam in "Looney Tunes" (Japanese)
Yosemite Sam in "Space Jam" (Japanese)
Zappa in "Poporogue" (VG) (Japanese)
Zou-Daimaoh in "Puyo Puyo" (PC Engine CD-ROM²) (Japanese)!~

Otokojuku is the kind of school that seems like it's up to no good. For most of their students, this is the only place that will take them despite or even because of their violence issues. Headmaster Heihachi Edajima believes that giving young men a military education will provide them with brighter futures, but how much is wishful thinking? 
 
(Source: Manga Planet)

Set over 10 years after the conclusion of Sakigake!! Otokojuku, this manga focuses on Shishimaru Tsurugi, son of Momotaro Tsurugi from the previous series, and a new generation of Otokojuku students, while still featuring much of the same school staff. Like Sakigake!!, the plot focuses on the hellish training of Otokojuku, fighting enemies, and the births of new friendships. 
 
(Source: Wikipedia)

The prequel to Otokojuku focusing on the early life of Edajima Heihachi, principal of Otokojuku. The story covers his university days, his war efforts, and much more.

Years after the events of Ultimate Path Private High School 2011, Edajima Heihachi is informed of an invading alien race called the Susanoo, who seek to harvest the testicles of Japanese men to harness the Spirit of Yamato as an energy source. As a countermeasure, Edajima assembles all Otokojuku alumni, from the now-aging fighters from Sakigake!! Otokojuku, to the still young second generation from Akatsuki!! Otokojuku, and finally to the former Ultimate Path Private High School students who transferred to Otokojuku. Led by Tsurugi Momotaro, the Otokojuku alumni embark upon a quest to outer space to protect Japan from alien invaders.

When the Devil King announces his retirement, he calls forth his two sons, Yomi and Sora, to give them each a quest. Whichever of them finds a pure Yamato maiden within a year would inherit the throne of the Devil King, while the other would die. Thus begins Sora's sex-fuelled adventure to find a woman that can satisfy his father...