Despite the best known members of the corps, like Hal Jordan and John Stewart being space cops, Earth's first Lantern was far different.

Source: https://www.cbr.com/green-lantern-first-human-dc/

In an exclusive interview with CBR, Brandon Thomas and Natacha Bustos shared the origins of their Green Lantern short story, explained what John Stewart means to both of them, and offered a sneak peek at "Keeping the Peace."

Source: https://www.cbr.com/dc-power-brandon-thomas-natacha-bustos-interview/

It is unclear if Fillion's Green Lantern has existing relationships with Hal Jordan and John Stewart, who will also be joining the DC Universe, but it is possible he may make a guest appearance in the Lanterns TV show.

Source: https://screenrant.com/nathan-fillion-green-lantern-costume-dc-universe-fan-art/

John Stewart grapples with becoming part of the Radiant Dead.

Source: https://bleedingcool.com/comics/green-lantern-war-journal-4-preview-glow-or-die-john/

There are several iconic DC characters set to debut in the first chapter of Gunn's DCU, including the Green Lanterns Hal Jordan and John Stewart, Booster Gold, Swamp Thing, a new Batman and his son Damian Wayne, and many more.

Source: https://screenrant.com/james-gunns-dc-universe-phase-1-plan-laid-out-in-neat-fan-made-graphic/

The series primarily focused on John Stewart as he battled his way back to Oa, while Jo Mullein led an investigation into the attack.

Source: https://www.cbr.com/dc-best-current-comic-books-2020s/

What could possibly be controversial or bad about introducing John Stewart into the Justice League?

Source: https://www.cinemablend.com/superheroes/snyder-cut-fans-new-hashtag-scrapped-green-lantern-scene-i-agreee

What I love about John Stewart has less to do with me and more to do with the fact that an entire generation of kids that saw him the first time on the cartoon rightfully view him as Green Lantern and have no idea who Guy or Hal even is.

Source: https://www.cbr.com/dc-power-brandon-thomas-natacha-bustos-interview/