The verb to feature means to spotlight or to highlight in this context. While Japanese comics spotlight long-running stories, American comics only highlight the most important hero.

include/contain/display prominently New Oxford American Dictionary verb [with object] have as a prominent attribute or aspect: the hotel features a large lounge, a sauna, and a coin-operated solarium. • have as an important actor or participant: the film featured Glenn Miller and his Orchestra. • [no object] (feature in) be a significant characteristic of or take an important part in: his later paintings feature prominently in the exhibition.

Thank you Benjamin

Correction: Would you tell me what 'feature' means in this text? Feature here means 'have/show/exhibit/contain'