The Justice League was formed by DC Comics in 1960 to unite seven of their greatest heroes in comics at the time, from Batman to Aquaman. In the over six decades since their creation, the team has expanded greatly, with a slew of unique rosters that assembled heroes from across the DCU. With such variety on the powerhouse team, countless heroes from across indie comics would also be great fits to serve on the JLA alongside Batman and Superman.
Source：https://www.cbr.com/justice-league-indie-comic-heroes-who-could-join/
