Silver the Hedgehog is an anthropomorphic silver hedgehog in the Sonic the Hedgehog series of games, where he hails from at least 200 years in the future. He is a 14 year old hedgehog, weighing 35 kg and is 100cm tall (3ft and 3inches).
His main role in the games is to protect the future by changing the problems in the past with the help from his ESP, which are psychic powers. He has the ability to time-travel.
Silver was created in order to utilize the new physics engine added to Sonic the Hedgehog (2006).
It is generally understood that Silver is based on (Future) Trunks of Dragon Ball Z, because both come from the future to fix something in the past, both lose someone they care about deeply in their futures (Gohan for Trunks and Blaze for Silver), both have super forms (Super Silver and Trunks' Super Saiyan), and both gain something from their experiences in the past that helps them defeat their disaster (strength and knowledge of the Android's weaknesses for Trunks and knowledge of how to defeat Iblis for Silver). His entry in the game script reveals that even his creators compare the two.