He is one of Tezuka’s most often-used stars, typically playing a thug or gangsters and commonly appearing as a secondary antagonist or supporting character rather than villain.  He is a frequent cohort of Tezuka’s other rogues, such as Skunk Kusai, Acetylene Lamp and/or Hamegg, though generally less intelligent and more prone to direct violence – a trait which often leads to him being used by the others.

First appearing in Astro Boy (1952-68), Marukubi Boon as appeared in almost every major Tezuka series, including 14 appearances over the course of Black Jack (1973-83) alone.

Modelled after French actor, Lino Ventura, Marukubi Boon is easily recognizable by his thick bull neck, thick black eyebrows and the dark semicircles under his large eyes.

(Source: Tezuka In English)

In Dororo, ~!he is Hibukuro, Dororo's father and leader of a gang of bandits.!~

A man from the slums faces his doppelganger from the other side of the tracks; three guests visiting a hot spring are reminded of their past sins by a magical ringing bell only they can hear; stranded on the moon, an astronaut is stuck within a crater, sustained for a century by a mysterious life-giving gaseous fume the moon crater expels.
The Crater is a collection of self-contained short stories, ranging from horror, mystery, to science fiction. World renowned author Osamu Tezuka introduces you to an ominous world of sin and regret—you don’t want to miss this one! (Source: DMP)

A samurai lord has bartered away his newborn son's organs to forty-eight demons in exchange for dominance on the battlefield. Yet, the abandoned infant survives thanks to a medicine man who equips him with primitive prosthetics - lethal ones with which the wronged son will use to hunt down the multitude of demons to reclaim his body one piece at a time, before confronting his father. On his journeys the young hero encounters an orphan who claims to be the greatest thief in Japan.
 
Like an unforgettable road movie, Dororo reaches deeper than its swashbuckling surface and offers a thoughtful allegory of becoming what one is, for nobody is born whole
 
(Source: Kodansha USA)

Before producing a TV series, a pilot film was made to let sponsors and television stations grasp the work's pervasive quality. This is the pilot film for "Dororo" in which the characters are closer to those of the original story compared to the characters in the TV series. The faces and personalities of the characters in the TV series are altered from time to time to gain popularity among its viewers. As a result, sometimes viewers really loved it, but at other times it didn't go over as well. The pilot for "Dororo" was made in color, but the TV series was monochrome due to a tighter budget. The story depicts a journey in which the boy thief named Dororo and a cursed man called Hyakkimaru destroy monsters. Hyakkimaru can be a complete "human" only after he destroys 48 devils. 
(Source: Official site)