In the Chinese localization, it is instead named as "Wuji" (無極, lit. Extremeless/Apolar/Infinite). Wuji is also represented by an empty circle atop the Taijitu (太极图 lit. Great Poles' Chart), which includes the well-known Yin and Yang . His Wuju Style ability in Chinese is also dubbed as "Wuji Jiandao" (無極劍道, lit. Extremeless Sword Path), "jiandao" is also the pinyin reading of Japanese kendou.
The original version of this skin prior to his visual upgrade had notable oddities, such as his blade being held the opposite way, and closer inspection of his Alpha Strike animation showed Yi leaving afterimages of one of his auto-attack animations (shown as rapidly performing his auto-attack animations at fast speed instead with a 3D model viewer). These issues were fixed for the visual-updated version.
Both he and PROJECT: Ashe [S|L] are the only two PROJECT skins to have extra altered animations from the rest of the others in the skin line, and several new quotes (the others mainly recycle their original quotes in a robotic filter).
PROJECT: Yi is also unique for having two different braking animations from his normal running animation, and has only two different running animations compared to all his prior skins.
PROJECT: Yi is the only PROJECT skin to lose a larger majority of his armor in his animations (upon both his death or during his ultimate).
He was conceived as 'Cyber Yi' by Marco 'Wendigo' Silva (an artist from the Riot Games Inc. São Paulo office).