Besides Sonic, which other Sega character was a playable character in "Super Smash Bros. 4"?

Bayonetta, the stylish Umbra Witch, joined the roster of "Super Smash Bros. for Nintendo 3DS and Wii U" as a downloadable content (DLC) character. She was revealed on December 15, 2015, and released on February 3, 2016, making her the final DLC fighter for the game. Her inclusion was particularly significant as she emerged as the top choice in a worldwide fan ballot, where players voted for characters they wished to see added to the game.

The Bayonetta series, though often associated with Nintendo due to the publishing of "Bayonetta 2" and "Bayonetta 3" by Nintendo, is actually owned by Sega. The original "Bayonetta" game was developed by PlatinumGames and published by Sega in 2009. This makes Bayonetta the second Sega character to become a playable fighter in the "Super Smash Bros." franchise, following the iconic Sonic the Hedgehog, who was introduced in "Super Smash Bros. Brawl".

Bayonetta's unique combat style, characterized by her "Bullet Arts" and "Witch Time" abilities, translated well into the fast-paced "Super Smash Bros." gameplay. She quickly became a fan favorite, known for her intricate combo potential and distinct flair. Her addition brought a more mature, action-oriented character to the typically family-friendly fighting game, further diversifying its already eclectic roster of gaming icons.