DCUC JOHN STEWART

"John Stewart is an architect and veteran USMC who was selected by the Guardians as Hal Jordan’s backup after Guy Gardner was seriously injured in a disaster. Although Jordan objected after seeing that Stewart had a belligerent attitude to authority figures, the Guardians stood by their selection.

To Jordan, Stewart’s first mission began badly with the assignment of protecting a racist politician and Stewart took advantage of averting an accident to embarrass him in the process. However, Stewart soon proved his worth when an assassin shot at the politician, but Stewart refused to intervene with Jordan to move in response to the attack. Stewart had good reasons for this apparent dereliction of duty when he stopped a gunman from killing a police officer in the outside parking lot at the event while Jordan was pursuing a decoy. When Jordan confronted Stewart about his actions, Stewart explained that the politician had staged it for political advantage. With that adventure, Jordan concluded that Stewart was an excellent recruit after all.

For some time, Stewart occasionally filled in for him as Green Lantern when Jordan was unavailable, including some missions of the Justice League.

After Jordan gave up being Green Lantern in the 1980s, the Guardians selected Stewart for full time duty. Stewart filled that role for some years, during which time he married Katma Tui, the Green Lantern of the planet Korugar who was initially assigned to train John in the use of his ring. Kat and John served together within the Green Lantern Corps of Earth alongside Hal Jordan, Arisia, Kilowog, Salaak, and other alien Green Lanterns."
[from wiki]

John’s first appearance

DCUC John Stewart

John came with a gun construct

John using a giant hand construct.

Size comparison of John Stewart to Kilowog.

John with fellow Green Lanterns Kilowog and Tomar Re.