Sai the Art-nin
Sai was a member of ANBU Root, where he was raised and conditioned to have no personality, connections, or a name. He was really close to his "brother", Shin, who had died from an illness. Following that, Sai locked up his emotions, got further conditioned, and hid behind fake smiles.
He infuses chakra into his ink beforehand, and uses a scroll to draw on incredibly fast and then bring his pictures to life with Super Beast Imitations Picture.