Tousen
Nori was a pretentious little dragonfly with big eyes and long, membranous wings. She was constantly buzzing around whatever room she was in, watching everything and offering (often unwanted) advice. In Soul Society, she would always flit back to Tousen's shoulder, whispering her observations in his ear and perching on his shoulder before he sent her away again to gather more information.
Later, in Hueco Mundo, Tousen no longer bothered with her observations. Once she made it clear that she could not reconcile the betrayal of their friends with Aizen's ideals, he stopped listening to her altogether. By the time of the final battle, she was a shadow of her former self. When her shinigami called on his unnatural resurrection, purposely forcing hollowfication on his soul, the tiny dæmon dissolved quietly into luminous Dust, and then to nothing.
It was the relief in her eyes as she died that finally convinced Komamura that Tousen was lost for good.
Tousen's Dæmon
Species: Emperor Dragonfly (Anax imperator)
Name: Nori (Belief), short for Minori (Truth)