Rokkaku is the consummate traditional Japanese student. A little absent-minded and slow on the uptake, likely because of all the hours he spends hunched over a desk, he's usually given the role of someone's "friend from school" or some other kind of nondescript man-in-the-crowd.
Although a minor Star, Odawara Jochin is a specialist at playing the somewhat innocuous "buddy" role. His ability to lend an ear and/or doll out some sound advice has had a long successful career being cast in roles such as teachers, doctors, researchers, and classmates. However he's also had success in roles on both sides of the law - able to play both a villain's henchman and a cop's partner with the same even keel.
Another of Tezuka's fill-in cast, Dime Baldspot is a specialist at playing two-bit crooks and other ne'er-do-wells. Self-serving and lazy rather than actually evil, he usually finds himself in a supporting role, as a member of a band of crooks or a nameless henchman under the control of the primary villain - often Hamegg.
Despite his name, Monster is the epitome of the handsome leading man. Early on in his career he was cast as a bit of a "bad boy" - good looking but a bit uncouth and rough around the edges - in protagonist roles such as heroes of the jungle or the wild west. However, in his later appearances he is cast in the much more traditional roles of a sophisticated leading man, as urban movie star, handsome love interest or secret agent.
Ongoing Serial: a series of episodes, published over a span of weeks/months/years where the story plot is connected from chapter to chapter and must be read in chronological order for it to be understood properly.
Chapter Serial: a series of episodes, published over a span of weeks/months/years where the story plot is self-contained to a single chapter. There may be an overarching plot, but the stories can generally be read in any order and be understood
Book: an all-in-one self contained story published as a one-off.
Supplement: an an all-in-one self contained story published as a stand-alone supplement to a regular weekly/monthly periodical.
Short Story: an all-in-one, self contained story that was published in a regular weekly/monthly periodical
Anthology: a collection of all-in-one, self contained stories that were published in a regular weekly/monthly periodical but are generally grouped together.