Sonic (USBIV)

Sonic is a startable playable character in Ultra Smash Bros. IV and makes his third appearance in the series since Brawl. He was confirmed on the first day during the revelance at the Rivalery Week due to be a third party character from SEGA, including Bayonetta, alongside with Bandai Namco's Pac-Man, Capcom's Mega Man and Ryu, Ubisoft's Rayman, Square Enix's Black Mage, Cloud and Sora, Konami's Bomberman and Snake, WayForward's Shantae, Yacht Club Games' Shovel Knight and Vanpool's Dillon. In his own titular series, Sonic the Hedgehog, Sonic is the main protagonist and he's being the most iconic videogame character due to be well-known as the fastest thing alive. He generally protects his world, with his beloved sidekick Tails and his rival Knuckles, against his nemesis Eggman and his robot army.
Sonic's voiceclips were reused from Smash 4 and officially remastered basically for his sentences at his taunts and his victory sentences. Roger Craig Smith reprises his role as voice actor in the Sonic the Hedgehog series until this day.
Sonic ranks the 24th place of the 103rd in the tier list, putting him at the top of mid tier classment (A) behind Mii Brawler and after Link. This is a slightly drop for Sonic being above of the list in Smash 4 but maintains his spot as a top tier character. Sonic possesses a quick speed agility to confuse opponents thanks to his special moves and his speed dash, once again he's one of the fastest characters in the game (second is Captain Falcon). His smash attacks (forward-smash and especially down-smash) and aerial attacks are possible to KO opponents.
However, KO opponents is a risky option for Sonic due to his lag. His approaches are terrible against projectile-based characters for their camping and zoning gamestyle. His Spring Jump is also a predictable recovery that can be gimpable easlily.