There are many left-handers well known by society and culture. Here is a complete list of Famous left handers. There is a picture of the person mentioned using their left hand, to prove otherwise that they are truly left-handed or prefer their left hand for writing. Below that image is their signature, and their name (and/or title).
This is a list of notable musicians who are either write left-handed, or play their instrument left-handed.
Left-handed are more inclined to artistic professions, to give an instance, lefties are about 10% to 15% of the general public, while among entertainers they are roughly 50%. [5]
(Note: Kurt Cobain and Jimi Hendrix both played guitar left-handed, but wrote with their right-hands. Kurt Cobain was ambidexterous, while Jimi Hendrix could have been forced to write right-handed. See talk page.)
While the pictures of Finn and Marceline are of them using their left hands, both of them are ambidextrous.
Melody from The Little Mermaid 2: Return To The Sea, is seen to be a leftie, as she usually holds her locket with the left hand.
Live action films
Tron
Hellboy
Video Games
Shadow the hedgehog
Hawke from Dragon Age 2 (ambidextrous, as he fights right handed in the game)
Reno from Final Fantasy
Dunban from Xenoblade Chronicles
Sephiroth
Cid Highwind from Final Fantasy VII
Roxie from Pokemon Black 2 & White 2
Shauntal from Pokemon Black and White
Most incarnations of Link wield their sword with their left hand
Ice Climbers (Popo (Blue) and Nana (Pink))
Xion from Kingdom Hearts
Luke fon Fabre from Tales of the Abyss
Princess Zelda (Wii version of Twilight Princess only)
Zero
Anime/Manga
Ryoma Echizen from the Prince of Tennis (self-taught ambidextrous)
Uryuu Ishida from Bleach
Nando from the Pokemon Diamond and Pearl anime
Hiei the Swordsman from Yu Yu Hakusho briefly lost the use of his right hand
Patricia Thompson from Soul Eater
Mio from K-On
Mayuri from Bleach
Edward Elric from Fullmetal Alchemist
Elucia de Lute Ima from Kami nomi zo Shiru Sekai
Haruhara Haruko from FLCL
Train Heartnet from Black Cat (born left-handed, trained to be ambidextrous and preferably uses right hand in battles, although still canonically better when using left)
Saitou Hajime from Rurouni Kenshi (Samurai X)
Superbi Squalo from Katekyo Hitman Reborn!
Yoshii Akihisa from Baka to Test to Shoukanjuu
Alma Tandoji from Sacred Seven
Gokudera Hayato from Katekyo Hitman Reborn!
Shimizu Raikou from Nabari no Ou
Graham Aker A.K.A. Mister Bushido from Mobile Suit Gundam 00 (attacks predominantly with left hand in dual-wielding mechs such as Masurao)