Cool! Oh, someday I wish I could have a multi-function high-tech circus ball! -Lemmy Koopa
Lemmy Koopa is a secondary character inA day with Bowser Jr, being one of Bowser Jr.'s brothers and one of Bowser and Peach's children.
Personality
Lemmy has a close brotherly relationship with Iggy, as he was defended by him in Living with Nerdy. His personality is joyful, fun and naive, as seen in Two Koopas for a throne. He also is impatient shown when Bowser Jr was reading the Castle Koopa Article, he said "Found anything useful" indicating that he was too impatient to read the information about Castle Koopa's artifacts.
First episode
In first episode (part 2), he cameos in the scene where Roy is shown as the best Koopaling. Morton Koopa Jr also cameos in the scene.
Living with Nerdy
In Living with Nerdy, Lemmy has his second cameo, being defended by Iggy from the Mario Fan Club and later watching as Bowser Jr and Nerdy fly in the out-of-control Koopa Clown Car.
Two Koopas for a throne
In Two Koopas for a throne, his role is bigger, appearing as one of Bowser Jr's sidekicks in the adventure along with Iggy. He appears doing tricks on his circus ball while Iggy is working on his high tech multifunction glasses. Lemmy says that he wishes that he could has a multifunction circus ball. Then Bowser Jr walks into the room and wants to ask why he is the heir. In the past on the Day Bowser Jr. was born, Lemmy along with Iggy were caught spying on Bowser when Bowser angrily threw a pillow at the plant Lemmy and Iggy were hiding behind. Back in the present, Lemmy joins the adventure into Castle Koopa.