Name: The Archfiend (real name Lucius Falthorne)
Age: 18
Powers/Abilities:
Yellow Power Ring-Skills: Lucius (or Archfiend as he calls himself now) obviously has the capability to "instill great fear". His psychotic and sadistic mind allow him to come up with atrocious and horrifying constructs be they "creatures" or torturous tools and machinery. Of course, this also ties in well with the ring's ability to project such images and feelings into the mind of another, scarring their minds to the point of insanity should they be unable to resist. The yellow lantern is quite agile and strong, and his physical abilities and hand to hand combat skills have only been enhanced both through the ring and intensive training by the Sinestro Corps drill sergeants.
--Weapons/Tools: His yellow power ring obviously, plus the dozens upon dozens of weapons and beings he can create with his twisted imagination.
Weaknesses: The Yellow Light of Fear is useless and even drained against the Blue Light of Hope. Also, Lucius must recharge his ring periodically or risk running out of power, after which he must either flee and hide or absorb energy from a different power source (like electricity).
Bio: Much of Lucius' life has been steeped in sociopathic and sadistic behavior, as he always took joy in the suffering and fear of anything he decided to victimize. Small animals and insects as a child, and then fellow humans (often students) as he grew and reached his teen years. Lucius had already been diagnosed and put on watch as a sociopath who could possibly be dangerous, but the final tipping point that landed him in a cell was when he actually carried out a threat he made to one of his school's... less than pleasant individuals. He threatened that he would "flay him alive and use his skin to make himself a new winter coat", and things quickly got physical. A few hard punches, and the other guy was down on the floor... and getting stabbed and cut into with a broken pencil....
In jail, Lucius made it a habit to torment the prisoners and guards, mentally more often than not. A day came when the wardens intended to kill him secretly, at which point the yellow power ring came to him and placed itself on his right middle finger. Things quickly got messy afterwards, and wherever the Archfiend flies, chaos and fear are sure to follow.
Other: Time spent as a Yellow Lantern and with his other allies, Lucius typically channels his "evil" onto crime and villains, mostly in an attempt to at least use himself for some good at live up to the "Let those who try to stop what's right" part of the Sinestro Corps oath.