Here's a couple I know:
Accelerator from A Certain Magical Index
Acnologia from Fairy Tail
Agito/Akito from Air Gear
Agunimon from Digimon Frontier
Aichi Sendou from Cardfight Vanguard
Airi from Queen's Blade
Akame from Akame ga Kill
Akeno Himejima from High School DxD
Akuto Sai from Demon King Daimao
Allen Walker from D. Gray-Man
Alphonse Elric from Fullmetal Alchemist/Brotherhood
Alucard from Hellsing/Ultimate
Alzack Connell from Fairy Tail
Annie Leonhardt from Attack On Titan
Archer from Fate/Stay Night (Picture)
Arystor Krory from D.Gray-Man
Assassin from Fate/Zero
Assassin from Fate/Stay Night
Asuna Yukki from Sword Art Online
Asura from Soul Eater
Atlas Flame from Fairy Tail 2014
Ayano Kannagi from Kaze No Stigma
Azazel from High School DxD New
Azuma from Fairy Tail
Here's a few I know-
Akiko-Taisho Baseball Girls
Akane Tendo-Ranma 1/2
Asuma-sensei-Naruto
Ahiru-Princess Tutu
Aoi-You're Under Arrest!
Ami Kawashima-Toradora
Amu Hinamori-Shugo Chara!
Akihisa Yoshii-Baka To Test
Akira Kogami-Lucky Star
Arisu/Alice-Pandora Hearts