From snapdragon12. The Gotei 13's resident Big Scary Man[tm].

Name: Shiryuu Kuroame
Age: 666 years physically 39
Nickname: Oni, Oni-chan by his lieutenant sister
Rank: Captain of 11th division
Location: Seireitei
Description: Tallest in seireitei 7'9. He has a black sheriff of nottingham beard with a shaved head along with the kanji for "endure" tattooed above his right eye. He wears the standard captains uniform leaving his chest exposed, he carries a rope belt with different demon masks hanging off it.
Personality: Shiryuu, is a battle maniac in the sense that he'd seriously consider cutting off his own arm if it would make a fight last longer. He enjoys fighting but hates it when it's over whether he won or lost unless it was a good opponent. Socially he conflicts with Totosen who would rather avoid fighting.
History: Because of his oppresive, constant release type reiatsu, Shiryuu was feared and outcast simply because of his nature. He became and looked to fighting as a way to relieve stress. When he entered shinigami academy he refused a zanpakutou, But Captain Tokugawa made a deal with him. If he accepted a sword, then narashima would teach him a real world fighting styles.
Zanpakutou name: Demon Bones
Zanpakutou Shikai: As he is a constant release type his sword is stuck in it's shikai which takes the form of two spiked kuckles. It's ability is that he can recover any wound so long as there's a trace of it left, if his heart was vaporised he couldn't get it back. It requires a lot of reiatsu, so it's perfect for a constant release like him.
Bankai: Demon Bones, New chance. Nothing changes except that he now gets greaves, shinguards, and a three horned crown. If he is killed while using this then a horn dissapears and he is completely resurrected. However it takes a century to recover one horn (Longer if it's more) so even like this he's careful no to get killed
Abilities: Refusing to learn kido and zanjutsu, he compensates by being average in shunpo. He is also master of hakuda, and various other real world martial arts, from muay thai to kung-fu.
Special traits: The masks at his belt act as limiters of different degrees, so that he can fight weaker opponents at their level.

Name: Ai Kuroame
Age:104 (appearing 16)
Rank: Lieutenant 11th company
Location: Seireitei
Description: Short, with shoulder length apple red hair and sunglasses. She wears a sleeveless uniform with fingerless fighting gloves and is often seen riding on her brothers shoulders.
Personality: Temperamental and tomboyish, she is often teased by Sakura or Aiko. (although she'd never admit she has a crush on Akitara Konrado). She deeply admires her brother and will help him in whatever way possible, which usually involves scaring off people who try get into his fights.
Zanpakutou Name and description: Ogre's Servant, An Average length sword with black bindings and a hannya shaped Tsuba.
Zanpakuto Shikai with phrase: "Pulverise Ogre's Servant" The blade transforms into an enormous Kanabo, the effect is that she can change the clubs weight, from feather weight to the weight of a freight ship.
Abilities: Her eyes have an unusual nature in that they can measure a persons reiatsu level, this is how she measure's an opponents strength, before her brother fights them. She wears sunglasses so that she doesn't get blinded by her brothers reiatsu.
Special traits. Though nowhere near as strong as Shiryuu, she is capable in Jiujutsu, the only Martial Art she was willing to learn from her brother.