Shinji Hirako

Shinji Hirako (平子 真子, Hirako Shinji) is the former captain of the 5th Division, preceding his lieutenant Sōsuke Aizen. He distrusted Aizen from the day they met, and thus made him lieutenant so he could keep an eye on him. Because Shinji never socialized with Aizen, however, he was easily deceived by Aizen's actions, culminating to his conversion into a hollow. Shinji's character is somewhat comical, adding a bit of levity to situations that are otherwise serious. He seems to like annoying his associate, Hiyori Sarugaki, which usually earns him a slap from one of her sandals. He also appears to have a history of referring to cute girls he meets as his 'first love', complete with a deadpan look on his face despite the obvious lie. An early design of Shinji can be seen in the first chapter's cover art, making it clear he was planned well before his introduction. During several points in the anime, Shinji's outfit is depicted to look like Lupin the III, likely as a homage on the part of the animators. Shinji's hollow mask resembles a pharaoh's mask. Shinji is quite skilled with his hollow powers, using a single cero blast to easily overwhelm Grimmjow Jeagerjaques. Not much has been revealed about Shinji's zanpakutō, as he rarely uses or even visibly wears it. He is voiced by Masaya Onosaka.

Source: Wikipedia