Sonia
This is an odd topic, but I've been thinking about it recently. I didn't mind Sonia's personality at all, but I couldn't stand her voice.
I love Jaleel White, and he made a great Sonic and Manic (I still can't get over the fact Urkel is Sonic, ha ha), but... I think someone else should have done Sonia. I was also disappointed with Louise Vallance as her singing voice. I know she's a good singer, but I don't know if I liked what she did to her voice while singing as Sonia. I just feel that she could have done so much better. Then again, I'm not sure how much I enjoyed Manic's singing voice either. (I thought Samuel Vincent's voice fit Sonic though.)
Everyone else's voices I liked or was okay with. Even Knuckles sounded okay. (For the SU version of him anyway.)
I was just curious how many thought Sonia really needed a different voice actor/actress or liked Jaleel White doing it, and if you want to add why, I'd love to hear explanations for any replies! And if you could have your pick of anyone to do her voice, who would you like to see doing it? Or if you have any other comments related to the voice acting, I'd love to hear it.