Tournament arcs have always been pretty common in shonen manga and anime. They are a fantastic format for authors to do two important things simultaneously: introduce a large ensemble cast, and display as many powers and abilities as possible in a short time. Variety is the spice of life, and tournament arcs are a great way to add variety to a shonen series.
Arguably the earliest major series to capitalize on them was the wrestling-centric Kinnikuman, which came out in 1979 and is still ongoing. Dragon Ball followed suit in the mid-1980s with three of its own tournament arcs. Tournament arcs have continued to be a recurring theme more recent anime, finding their way into series such as Naruto, One Piece, My Hero Academia, as well as becoming a major recurring part of the Pokémonanime. None of these more recent entries, however, have succeeded in topping Yu Yu Hakusho's Dark Tournament arc, which Yoshihiro Togashi began writing in 1992.
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Yoshihiro Togashi is better known today forwriting Hunter x Hunter (which also has a couple tournament arcs), but Yu Yu Hakusho was his first major hit. The story concerns Yusuke Urameshi, a delinquent who gets killed protecting a child and returns to life as a spirit detective, fighting demons. The supporting cast is composed primarily of his rival Kazuma Kuwabara and the demons Hiei and Kurama. The Dark Tournament Arc began in Volume 6 of the manga, spurred on by Yusuke's confrontation with the frighteningly powerful demon Toguro. Toguro, who far outclassed Yusuke in power at this point, forced him and his companions to enter the tournament under threat of death, along with everyone Yusuke knew. Thus, unlike many tournament arcs, the
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