Accompanying Momo is a talking black cat familiar named Daniel, with a bell around his neck and bat-like wings who helps Momo out. The living frequently hear the ringing of Daniel's bell when Momo and Daniel are nearby. Daniel has a calm character and does not show as much sympathy to humans as Momo, but is still patient with them. In the TV drama, Daniel is portrayed as a young boy rather than a cat.    -Wikipedia

A girl wrapped in white, her name is Momo...in her hand lies a blunt yet shiny scythe. By her side is a winged black cat by the name of Daniel. Carrying the souls of humans, the girl's existence parallels to that of a "Death God" or "Shinigami". At the instant when this white Death God touches the hearts of humans, the world is filled with kindness and grief...
 
(Source: Anime News Network)

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Ai Shimizu is a Japanese voice actress and professional wrestler. She has a career as a singer, signed to Lantis. She has released 14 singles (including joint and character singles) and four albums. She covered Yumi Matsutoya's "Toki o Kakeru Shōjo" as the B-side of her first single "Angel Fish" in 2003. She is known to have a close relationship with Mai Nakahara, having collaborated in eight anime where most of the characters they voiced in together had close connections: DearS, Kage Kara Mamoru!, My-HiME, My-Otome, My-Otome Zwei, Please Twins!, Sola, Strawberry Panic! and the Lucky Star drama CD. Shimizu has worked sporadic professional wrestling matches since December 2013

A Shinigami girl in white, unlike other Shinigami... A Shinigami girl meddling with humans, even those not to die, unlike other Shinigami... 
Shinigami A#100100 or Momo not only leads the souls of the deceased to the other world, but also leads the living to a better life, helping them overcome death...

In the darkness stands a girl draped in pure white. Don't let her innocent appearance fool you; her hands grip a glistening scythe. Momo is the dark messenger of death who, along with her wisecracking cat named Daniel, is tasked with releasing humans from their mortal bonds and delivering their souls to the great beyond. First encounters with Momo always end in farewells.
 
(Source: Seven Seas Entertainment)