Manga was an art style. It was possible for people to look "manga".
History
Tanya Adeola had three Sailor Moon posters in her bedroom. (TV: For Tonight We Might Die)
Darius Pike once told Jorjie Turner that she looked "manga" in her Magdalene Academy uniform in 2050. (TV: Sirens of Ceres)
The Kleptons had "...manga eyes, white with tiny black pupils." (PROSE: Placebo Effect)