Kuroneko-sama (黒猫様, lit. Mr. Black Cat) is a black cat who reoccurs in the background of the Trigun anime and manga.
Kuroneko-sama is a small black cat with big green eyes.
Not much is known about Kuroneko-sama's personality, but she acts like a normal cat.
She appears in every episode of the anime and randomly in the manga. Despite her level of recurrence, Kuroneko-sama has had few instances of plot significance. She stopped Wolfwood from cheating in a game of chess during Escape from Pain. Also when Vash is replaced by Kuroneko during Hang Fire. Nightow has stated that she is just something easy and calming to draw in between action scenes. His most common response to queries as to her nature or significance at anime convention panels is "Kuroneko-sama is a small black cat."
In Trigun Maximum, Kuroneko only appears in Nightow's commentary at the end of each issue, often criticizing the author's lazy and silly nature.
In Trigun: Badlands Rumble, Kuroneko can be first seen napping at the newsstand where Vash finds out he is blamed for Gasback's bank heist. The cat can be seen again, watching Meryl and Milly as they discuss their situation with Cain's statue. Also, during the bar fight later in the film, Kuroneko flies through the air along with many other items, seemingly thrown by someone as a projectile.