Kilowog (Earth-6531)

"You're all just rookies right now. Rookies who have all been chosen to serve, protect, and obey. You've been recruited like others have for millennia because you all have the potential to overcome fear. After I'm finished with ya, some of you might do just that... and some of ya might be able to learn how to use those power rings. Some of you might even get to be one of the seventy two hundred who will protect the universe as agents of the Guardians of the Universe. Yep, some of you might become members of the Green Lantern Corps. Then again, some of you might not. Any questions?"

- - Kilowog to his trainees

Kilowog is a commander of the Green Lantern Corps. A notable war hero, he has aggressive tactics in the battlefield, and was charged by the Guardians of the Universe on training recruits to become Green Lanterns, accepting no more than perfection from his students. When Hal Jordan became a Green Lantern after the death of Abin Sur, Kilowog was instructed into teaching him the ways of the Green Lanterns. Initially hostile to Jordan, Kilowog became his best friend and ally after Hal saved Earth from Parallax, and later Oa from the rising Manhunters.

Return of Parallax
"In brightest day, in blackest night, No evil shall escape my sight. Let those who worship evil's might Beware my power--Green Lantern's light!"

- - Kilowog

Kilowog was present during Thaal Sinestro's speech about the coming danger and approach of Parallax. After the speech, he, alongside all of his other fellow Green Lantern Corps, raised their power rings to the air in unison while chanting the Green Lantern Oath.

Training Hal Jordan
"C'mon, hit me. Your enemy is not going to play fair."

- - Kilowog to Hal Jordan

Afterwards, Kilowog was tasked by Sinestro himself to train Hal Jordan, a human who then recently became a Lantern as a substitute for Abin Sur, who was killed by Parallax. Kilowog started to demonstrate the virtual unlimited capabilities of the power ring, but relying more on strength rather than creativity, which saddened his fellow Lantern Tomar-Re, who took upon mentoring Hal.

Kilowog proved to be a big deal for the human, but not without taking his fair share of few hits. Before they could continue, Sinestro arrived and attempted to train Hal himself.