Sinestro

Thaal Sinestro is the arch nemesis of The Green Lantern Corps and Hal Jordan. Once one of the most powerfull Green Lantern's. Sinestro was mentor of Hal Jordan and leader of the "Sinestro Corps"

Origin
Once one of the most respected members of The Green Lantern Corps and one of the most powerfull to ever wear the Power Ring. He was chosen to be mentor of Hal Jordan, Green Lantern of Earth. Sinestro learned Hal everything he knew. There first mission togheter was, to track down Kuch the alien that killed Abin-Sur. Sinestro met Labella, the only one knowing where Kuch was. Sinestro tortured Labella bad to let her tell the truth. Hal stopped him before he did real harm. Sinestro was flaming by Hal's disobediant behaviour. In secret Sinestro found himself in a plan working with the criminal Kanjar-Ro, to tell him where the Yellow Element hided. Sinestro killed Kanjar-Ro. He orderd Boodika, to kill Hal. Getting a new Yellow Power Ring and Power Battery he destroyed The Green Lantern Corps and killed hunderds of Lanterns one of them was Tomar-Re. He wanted to start a new order but was destroyed by Hal Jordan. Kilawog broke his hand.

Now Sinestro has allied himself with the greatest Criminals and formed "The Sinestro Corps".

Powers and Abilities
Sinestro's Yellow Power Ring has the exact same powers that every Lantern ring has. Only using fear as his power source instead of will.