Silver

Silver (the hedgehog)
Silver is a Sonic character that was first introduced in Sonic the Hedgehog (2006). Silver was also in Sonic Rivals, a game that was released like 3 days after Sonic '06.

Story
Uh, Silver's story? Uh... in Sonic '06 he... he's made at Sonic because a mouthless blue shadow told him that Sonic did something bad? BOOM. There is Silver's lore.