Bowser is the heaviest, and the strongest character of Ultra Smash Bros. IV. He also the main antagonist of the Super Mario series. Bowser is confirmed two days later after Captain Toad and Nabbit trailer, with Bowser Jr. and his Koopalings. Generally in Mario's universe, Bowser is the ruler of the Koopa Kingdom and tries many attempts to kidnap Peach. But Mario is always on the front his road to protect her.
Bowser's voice is the same as in SSB4.
Bowser ranked his 61th place in E in the tier list, which it makes a average character to play at the tournaments. He stays at the same tier rank but a bit lower, which it makes a huge drop for Bowser since SSB4.