These are characters from the Nintendo fighting game Super Smash Bros. Brawl.
“Link is the hero of the Legend of Zelda series. Link - The Zelda character., Link (SSB) - Link's...Link (The Legend of Zelda)
“Sonic the Hedgehog is the Mascot of Sega. Sonic the Hedgehog - The Sega character, Sonic (SSBB...Sonic the Hedgehog (character)