The quick-witted blue hedgehog, who is often impatient with slow things. Although he can be cocky at times, he can also show off emotion at times like these as well, he is honest, loyal to his friends, keeps his promises, and hates seeing his friends cry.

For the voice of Sonic, I'd say any kind of similar to any Sonic voice will do. Whether that be Ryan Drummond, Jason Griffith, or Roger Craig Smith.....

https://www.youtube.com/watch?v=EH1Li0xkE1g

https://www.youtube.com/watch?v=jtQPV4D0DBE  

https://www.youtube.com/watch?v=d8FmU0y6mio

....Or whether you do an original Sonic

Examples for said original take on Sonic:

https://www.youtube.com/watch?v=ScH3gbQoQcA

https://www.youtube.com/watch?v=MfhIj8eIRNU

It is required that you have vocal range, as in you can scream/cry/whisper/etc. and still sound like sonic without doing the same vocal range AKA none of that Sonic Omens Garbage