Sensōtanzō Ryūsei

"Your unwillingness is baffling. You lack enthusiasm, and a reason for life itself. As far as I see it, you are a mere fabrication. A being with no purpose but yourself. A selfish man you are indeed. When you love someone..when you have someone you cherish and wish to defend. That's when you find purpose and you can become powerful. And, if you are unable to commit yourself to Yuuma.. Then you won't have to worry about him, because I'll kill you myself!"

- Sensōtanzō Ryūsei to Tobi

Sensōtanzō Ryūsei (戦争鍛造精流, "Ryūsei Sensōtanzō lit. Flow Forger of War") is a member of Death's Hand. He is regarded by some as a master of planning and the most adept war tactician in Hueco Mundo ever. His key battling strategies and precise intel enable him to execute missions with the upmost of ease. He is also assumed to be the strongest in Yuuma's Hollow Army.

Zanpakutō
Derramamiento de Serpiente (開口ヘビ); Derramamiento de Serpiente, Spanish for "Shedding Snake", Japanese for "Opening Snake").

Behind the Scenes
Though this character plays a vital role in Yuuma's Army, he dies early in the story. The reason for that is show that I may show Tobi's power and emphasize his own power. And also, after his death he still plays a constant and important role in Yuuma's Army battle strategies.