Silver the Hedgehog

Silver the Hedgehog is a character from the Sonic the Hedgehog and Sonic Universe series, who originates from the future.

Pre-Worlds Collide
Silver arrived from the future in hopes of discovering who betrayed the Freedom Fighters.

While working with the Secret Freedom Fighters, he found that it was the roboticized Sally Acorn (now referred to as Mecha Sally), and sought to help both Team Fighters and the Arctic Freedom Fighters to save her. During the fight, he managed to disable her, but before more could be done, the Genesis Wave was activated. (Sonic the Hedgehog #247/FCBD 2013)

Worlds Collide
After the Genesis Wave occurred, Silver met up with Sonic shortly after Sonic had sent Team Chaotix to investigate the disappearances of Knuckles, Tails, Shadow, and Amy. However, Silver eventually ended up captured by Copy Robot in front of Sonic. (Sonic Universe #51)

Silver was then turned by Doctors Eggman and Wily into the Roboticized Master, Silver Man. His Special Weapon was Psycho Burst. He, alongside most of the Roboticized Masters save for the Chaotix, was later dispatched to attack Proto Man in the Skull Egg Zone. (Sonic the Hedgehog #249)

Silver Man, alongside Blaze Woman, later ambushed Sonic and Mega Man just as they were about to scale invisible blocks. Silver Man was able to land a hit on Mega Man with his Psycho Burst, although not without being hit by Mega Man's Sonic Blast at the same time. His identity reasserted, Silver then proceeded to hold Rose Woman at bay just as she was about to roast Sonic alive with her Fire Tornado while Mega Man stopped her with the Sonic Blast. Although thankful for Sonic and Mega Man restoring them, Silver declined to help, due to being too exhausted from the whole ordeal. (Mega Man #26)

Silver aided Mega Man, Sonic and the rest of their friends in fighting off an army of Robot Masters. He did well in fighting off most of them with his psychic abilities only to be taken by surprise by Flash Man (who upon noticing his fur was jealous of him having too much hair). Though he escaped and continued helping the others. (Sonic the Hedgehog #250)

Eventually Silver and the rest of his allies were aided by Dr. Light's Robot Masters, though the entire team was caught up in the Super Genesis Wave. It was, however, reversed by Sonic and Mega Man (both of whom achieved super transformations). (Sonic the Hedgehog #251)

Post-Worlds Collide
Due to Dr. Eggman interfering with Sonic's attempt to restore their world, history was altered. One change noticed is that Silver hadn't been seen since helping Sonic and Tails to save The Wisps (as depicted in the game Sonic Colors). (Sonic the Hedgehog #252)