From the Sonic Wikia: Clove is cool, collected, and mature and approaches unknown matters cautiously. She is very protective as seen in her interactions with Cassia, though to the point where she appears overprotective. In fact, her love for her sister is her primary, if not only reason for serving Eggman in the first place.

From what I know about her, I'd imagine her having a voice that's sounds a bit like Collen Clinkenbeard's Riza Hawkeye from Fullmetal Alchemist.