From the Super Mario Wiki
Michelle Hippe is a voice actress who portrays Larry Koopa in Mario Kart 8, replacing Lani Minella who portrayed Larry in previous games. Michelle reprises her role in Mario & Luigi: Paper Jam, Mario & Luigi: Superstar Saga + Bowser's Minions and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, and her Mario Kart 8 voice clips for Larry are recycled in its Nintendo Switch remake. Michelle Hippe also voiced Larry Koopa in Mario & Sonic at the Rio 2016 Olympic Games. Michelle Hippe provides Larry with a higher-pitched voice compared to Lani Minella's portrayal.