I don't think they can be classified as antagonists. The only antagonist of the episode would be Luan as she was the one pranking the Louds and she used the Doubles to do that. That doesn't make them antagonists, that makes them tools of the anatagonist.
The East Asian version of The Loud House, having first with The Loud House premiered in South Korea in May 2016. Jeong-Hwa Yang is the current dubbed Korean voice of main protagonist Lincoln Loud.
After South Korea, The Loud House will also its premiere in Japan on March 5, 2018 on NHK (without Nickelodeon's international brand). Ryoko Nagata will took role as the dubbed Japanese voice of Lincoln Loud. Nagata will also be trained at NHK's dubbing studio development near NHK Broadcasting Center in Shibuya, Tokyo.