Manhattan —

Born in Korea in the 1990s, eSports are growing increasingly popular in the U.S., Europe and parts of Asia. “League of Legends,” with more than 67 million players each month, is the champion of the genre. The online fantasy game, created in 2009, began with 40 characters and now has more than 125.

Scores of fans, many dressed as some of those characters, flocked to a celebration of “League of Legends,” hosted by its creator, Riot Games, and Tribeca Games. Riot Games executives promised that more characters are on tap.