Koji Fujibayashi

Koji Fujibayashi (藤林耕史 Fujibayashi Koji) is a main character of 48 Days. His epithet is "Bullettrain". Koji's speciality is Riding Duels, with his riding skills being comparable even to those of professional riders.

Canon Deck
Koji runs a Machimal Deck, a Deck featuring the fastest beasts and machines of the world. His playing style consists of quick effects that are Chained to his opponent's moves, in a way that Koji's effects "outspeed" the opponent's and resolve before them. This playing style makes it so that Koji basically doesn't use his own turn, but instead, makes his big moves during the opponent's turn.

One of Koji's favorite moves is bringing out his "Machimal Chimera Rocket G.R.Y.P.H.O.N." in response to an opponent's Special Summon effect that sets up the Summon of a boss monster. Using his quick Fusion effects, he can Fusion Summon immediately before his opponent's Special Summon, destroying their materials before the opponent can even Summon their boss monster. However, his true ace monster is "(name to be decided)", which he first shows against Itto - a monster that manipulates the order in which Chain Links resolve, making it so that Koji's monsters are always the fastest.

With the "Machimal" archetype including a very wide array of Extra Deck monsters - in fact, being a unique archetype with more Extra Deck members than Main Deck ones - Koji, initially plays predominantly the multi-material "Chimera" Fusions (in contrast to the single-material Metalmorph Fusions). However, to keep his moves unpredictable, he sometimes switches his Extra Deck monsters, for example, including the usage of Synchros for the special Event held by the Earth admin in the climax of Phase 1.

Helpful links:
 * Fastest animals in the world
 * Koji Main Deck Monster Formula
 * Koji Spell Sample

Discarded first concept
Koji runs a Sonic Fusion Deck, which makes high-speed plays during the opponent's turn. His Main Deck monsters are based on the fastest animals in the world, while his Extra Deck monsters are based on the fastest machines.

Edit: His Main Deck monsters are WIND Beast-Type "Supersonic" monsters, while his Extra Deck monsters are WIND Machine-Type "Hypersonic" monsters. His Synchro Monsters let a Fusion Monster be treated as a tuner for their Summon (making the Fusions be right away tuners would spoil it from the beginning).