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#1 is Hatsune Miku (no Anime obviously)
Probably Gintoki from gintama, I like the voice actor a lot. But in my heart is Black Rock Shooter with the nonsense aesthetic, just perfection.
I can't consider 2B an anime character but Nier has a anime so yeah, 2B is my favorite character overhaul.
En from Dorohedoro, Alucard, Guts, pink hair Dinosaur Girl, Black Hanekawa, Hitagi Senjougahara, Koko Hekmatyar, Saichi Sugimoto, Tokushirou Tsurumi, Asirpa, Saitama, Saya (Blood), Thorkell, are some of the best, but I feel like I am missing the very best
My favorite character is definitely Ruri Gokou (Kuroneko) from Oreimo. A Gothic Lolita dressed girl that suffers from Chūnibyō. She comes across as egotistical and haughty, but underneath is a shy, intelligent girl that very much cares for her friends. She's also voiced by Kana Hanazawa so that increases the endearing factor