Jack and Kate are the two coolest characters in LOST.
The "coolest character in the world" is a matter of personal opinion. My personal 'coolest character' is Roxas from the Kingdom Hearts video game series.
Edward!
He's the coolest comic character in St. Marys Middle by The Coolest Midget on the Block.
Biography - 1987 Henry Winkler Hollywood's Coolest Character is rated/received certificates of: Argentina:Atp
Kisuke Urahara. 'Nuff said.
Woods,bowman,and mason
jay in lego ninjago
Link, from the Legend of Zelda series, is by far the the coolest videogame character ever. The Master chief, John 117, from Halo, comes second.
Biography - 1987 Henry Winkler Hollywood's Coolest Character was released on: USA: 19 June 2000
"Coolest" is perhaps too subjective to give a definitive answer although, one might argue it could be Bart.
None of them are technically the coolest because everyone one has favourites. Mine is personally Dr. Spencer Reid. (as you can see in my username)
Sonic the Hedgehog, Shadow the Hedgehog, or Silver the Hedgehog