|Previous Affiliation||Gotei 13, Soul Society|
|Position||Leader of the Vizards|
|Previous Position||Captain of the 5th Division|
|Previous Division||5th Division|
|Previous Partner||Sosuke Aizen|
|Base of Operations||Vizard Warehouse|
Shinji has brown eyes and jaw-length blonde hair with a straight cut and many of his facial expressions reveal his upper teeth. He wears a standard Karakura school uniform, though he usually wears a gray long-coat, shirt and tie, a newsboy cap (though he commonly forgoes wearing the coat and cap). Shinji appears to have a pierced round ring in the middle of his tongue.
During his first stint as a captain, before he left the Soul Society, his hair was very long, reaching down to the lower part of his back. He wore the standard Shinigami robes with a standard, long-sleeved, captain's haori. Seventeen months after Aizen's defeat, Shinji returns to this attire with the addition of wearing his tie tucked under his robes. His hair which he kept in a short, straight-line cut after becoming a Vizard has remained basically the same as well, with the exception of the bang now having a more asymmetrical cut with the left side being longer than the right.
Shinji is somewhat comical, adding a bit of levity to situations that are somewhat serious.He has a flippant attitude under normal circumstances and seems to like annoying his associate, Hiyori Sarugaki, which usually earns him a slap from one of her sandals. She, in turn, shows him absolutely no respect and frequently insults and attacks him; his behavior towards her is no better, frequently making faces or quick insults at her expense. He also has 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 (though he never did this with Hiyori, further annoying her). He also enjoys listening to jazz music, as he had a phonograph that played his vinyl records in his days as a Captain.
Underneath this, though, he is quite perceptive in terms of regarding other people, and during his time as a captain, was one of the few people who appeared suspicious of his then-lieutenant Sosuke Aizen, and could apparently sense or see through some of his illusions. He also quickly notes parts of Urahara's personality. Aizen even admitted to being somewhat intimidated by him. Whenever angered or in combat, Shinji is fairly calm, serious, and level-headed.