Silver is the Nero to Sonic and Shadow's Vergil and Dante. He's cocky like Sonic/Dante and more serious like Shadow/Vergil but is more brash and impolite than Sonic/Dante as well as emotional, hot-headed and transparent with his feelings unlike either of the aloof main rivals. That's JP/Rivals Silver anyway, American Silver is just whatever the writers and voice actors think a 14 year old should be like at the time with a dash of Trunks.