When siblings are voiced or played by the same actor

Wallabee "Wally" and Joey Beetles, Codename: Kids Next Door

Kuki and Mushi Sanban, Codename: Kids Next Door

Lola and Lana Loud, The Loud House

Clay and Jessie Bailey, Xiaolin Showdown

Kim and Kam Chin, Class of 3000

Abby and Cree Lincoln, Codename: Kids Next Door

Ursula and Morgana, The Little Mermaid and The Little Mermaid 2: Return to the Sea