I was introduced to a fantastic artist (tragically not in person) last night named Takashi Murakami. He’s credited with creating the superflat style,

[Which] is characterized by flat planes of color and graphic images involving a character style derived from anime and manga. Superflat is an artistic style that comments on otaku lifestyle and subculture, as well as consumerism and sexual fetishism.

according to Wikipedia.

You might have seen Murakami’s work on the cover of Kanye West’s album, Graduation.