Duke Nukem & Sonic Adventure.
Sonic The Hedgehog.
Trouble Shooter / Battle Mania.
Update: Despite what the evidence suggested, Jaleel has just gone on record saying he was not approached by SEGA to voice Sonic.
Video interview where SEGA employee Aaron Webber states it was “either Jaleel or no voice at all”.
Article where Stephen Totilo states (after talking to Webber about Sonic Generations) “Sega couldn’t get him [Jaleel White].”
Sonic the Hedgehog 3.
Found another site saying the crescent was inspired by the Nike logo: http://bit.ly/ZZSDLU
Jet Set Radio (Jet Grind Radio).
Sega and Sony.