Tirando a capa do Epic Yarn, é comum que no Japão ele esteja feliz, enquanto no ocidente ele esteja "bravo".
Shinya Kumazaki, o diretor da HAL, explica:
For the Japanese versions we are, at [Kirby developer] HAL, involved in everything throughout development, including the package design. The most powerful image of Kirby is that cute image, we think that's the one that appeals to the widest audience.
While it does start cute, we know there is a serious side to Kirby as well. What we have heard is that strong, tough Kirby that's really battling hard is a more appealing sign of Kirby [in North America], so that's what we feature in the US.
NT: "Sabemos que há um lado sério no Kirby. E ouvimos que um Kirby forte e que luta arduamente tem mais apelo na América, então é por isso a diferença."
http://www.nintendolife.com/news/2014/04/hal_laboratory_director_explains_why_kirby_tends_to_be_a_ball_of_rage_on_western_covers