Jack Fitzwarren
TURNABOUT

As you can see, Turnabout isn't a typical costumed crook.
Born in Gotham thirty-one years ago, he got into the criminal line of
work at the age of nineteen, working as a mook for criminals and
costumes all over the Dark Knight's city. He quickly developed a knack
for not being where the bullets flew, and soon got the hang of
interpersonal relationships enough to be one of the city's big go-to
guys when you needed a mook wrangler. Around this point, he was hired
by Poison Ivy to make the first overtures of friendship toward Harley
Quinn, a task he pulled off with surprising success. It was also at
this time that he forged a lasting friendship and working arrangement
with the professional assasin Xyrus.
A run-in with the Batman later, Jack found himself headed out of
Gotham. Passing through Prague, where he broke one of his cardinal
rules (never sleep with an employer) after being deceived into thinking
he was dealing with a clone, and a short time in Egypt with Xyrus
(during which time he found himself dating Lady Shiva, a decision he
doesn't regret but also can't quite believe he made) he found himself
in Keystone City.
He liked it there; the opposition might be super-powered, but it also
didn't fight as nasty as his hometown. (He would shortly find himself
back in Gotham for a brief period, deriving no small amount of
entertainment from Xyrus' dalliance with the vigilante Huntress). One
day, he had a run in with someone he hadn't expected to; Fire (formerly
of the Justice League). He fully expected himself and his team to be
overwhelmed, but kept slugging anyway - he depended on his reputation,
and his reputation depended on him making sure the job got done.
Fire hit him with a bolt of flaming energy... sputtered... and fell
from the sky, powerless. Jack found himself able to manipulate fire
energy.
He took the name Turnabout after further testing of his powers and the
discovery that each one would peter out with time.
After a stint with LuthorCorps' Special Acquisitions Project in which
he was apprehended during a raid on Wayne Enterprises by Robin, he
found himself in the Black Orchard superpenitentiary, where he was
approached by the grey man Carceri to become part of the new Suicide
Squad.
His agreement reunited him with Xyrus, as well as matching him against
the alien Tyrant, the transdimensional gladiator Caine, the assassin
Deadshot, drug-fuelled speedster Withdrawal, and others. Becoming one
of a number of leadership figures in the Squad has been good to
Turnabout; he was able to lobby for the Suqad to receive training in
useful skills, making them more useful when they would finally be
released. He also delivered the killing blow to the noted assassin
chief known as the Old Man of the Mountains during a furious battle,
and has been continuing to make friends and influence people.
The recent arrival of Poison Ivy on the scene has led to some odd
changes; after discovering his power when she tried to mentally
manipulate him, an odd dynamic has sprung up between the two. Her
experiments are finally leading him to a better understanding of his
metahuman nature, among other things...