Diddy Kong (USBIV)

Diddy Kong is a startable playable character in Ultra Smash Bros. IV and makes his third appearance since Brawl. He was confirmed 2 days before King K. Rool launch trailer and Dixie Kong one month later. In his own universe of Donkey Kong Country series, Diddy Kong is a notable sidekick of Donkey Kong in his own games. He helps Donkey Kong during his adventures as a second playable character to take the bananas back stolen by King K. Rool. Diddy Kong makes also his appearances in various Mario sports games, like Donkey Kong.
Diddy Kong's voiceclips were recycled from the Mario Kart series using his own original voiceclips than the previous Smash Bros. voiceclips. The voice actor that voices Diddy Kong is Katsumi Suzuki.
Diddy Kong ranks the 48th place of the 103rd (B) in the tier list, putting him at the third place of the high tier before Black Mage and after Ryu, making him a high tier character. This is a notable drop for Diddy Kong being a top tier in Smash 4 and also a little drop too since he was a high tier character in Brawl.
Regarding Diddy Kong's each movesets, he's quite nerfed, but his matchups are pretty good against top tiers, except for the top 6 (struggles somewhat against their matchups).