The Koopalings as they appear in Mario Kart 8.
The Koopalings are the seven minions of Bowser. They consist of Larry, Morton, Wendy, Iggy, Roy, Lemmy, and Ludwig. They first appeared in Super Mario Bros. 3 in 1988 and made their debut in Mario Kart 8 as playable racers. Yet they're quite popular in style.
Their screenshot from Mario Kart Tour official
The Koopalings were originally depicted as being Bowser's children, but this was changed when Bowser Jr. was introduced to the Mario franchise. They are all common boss enemies in various games and share similar characteristics, such as being childlike and mischievous.