Ada Vessalius Fanclub ♥ - MyAnimeList.net

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Ada (エイダ, Eida?) is Oz's little sister who adores him very much. After 10 years she attends Latowidge (ラトウィッジ), a prestigious school for nobles, of which she is a prefect. She keeps in contact with Oscar via letter and causes Oz and co. to sneak into Latowidge as she wrote that she has found a person she likes. It is revealed that she was the one who gave Raven his hat. It is hinted that she likes Raven, but in the later chapters she is seen on a date with Vincent. She has a cat named Dinah and later two cats (a black and a white one). The white one was named Snowdrop.
Ada's Seiyū is Kaori Fukuhara.

Pandora Hearts (パンドラハーツ?) is a Japanese manga series by Jun Mochizuki. Originally starting serialization in the shōnen manga magazine GFantasy published by Square Enix in June 2006. There are eight volumes currently released in Japan. The manga series was licensed for an English language release by Broccoli Books but has been dropped; it has been licensed by Yen Press since then. It has also been announced that XEBEC will be making an anime adaption.
PLOT:
Oz Bezarius, heir to one of the duke houses, has just turned fifteen. His life is rich and carefree, darkened only by the constant absence of his father. At his coming-of-age ceremony, however, everything changes. For no reason that he can discern, he's cast into the prison known as the "Abyss", only to be saved by a "chain" known as Alice, the bloodstained black rabbit. The mystery there begins as Oz unravels the mystery behind Alice, the Abyss and the strange organization known as Pandora. The series features heavy references to Lewis Carroll's "Alice in Wonderland" and can be considered both fantasy and mystery.

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