Due to the dub being Funimation, some of the voice actors are the same as in their previous dubs. For instance, Kasanoda and Tetsuya are Ayame and Shigure from Fruits Basket. Haruhi's father is Ritsu (also a cross dresser, interestingly).
In the dub, Tamaki is Death Scythe. Hikaru is Death the Kid. Mori is Free. Hunny is Medusa. Haruhi is Kim.
In Black Butler Haruhi is Ciel and Eclaire is Ciel's fiancee, Elizabeth, in the original Japanese. In the English dub Honey is Alois and Kyouya is Sebastian...
We all know Kyouya isn't the nicest guy around, but even he doesn't beat the light-catching prowess of VA-mate The Doctor. Honey is kid!Train, Chika is Leon, Haruhi is Saya, Kaoru is Shiki... the list goes on.
What Could Have Been: Originally, Kyouya's character didn't exist. The reason Hatori created him was because she was told to add seven more pages to the first chapter, hence, she figured she needed an extra Host Club member.