Jim Sweetwater

"Yikes! This guy is even worse than the Veil Heavy Troopers and Apocalypse Tanks combined! He must've be... James Calvin Sweetwater, also known as... Jim! Now this guy is gonna kill me!"

--Su Ji-Hoon, The Evil Abounds

James Calvin "Jim" Sweetwater Jr. (born 2001) is the older brother of Lola Loud's pageant rival, who works as the Supreme Commander of the Kingdom of Thailand, Lindsey Sweetwater, and Lucy Loud's friend and economic advisor George Sweetwate, and is the oldest child and older son of a scientific advisor to Richard Loud III, James C. Sweetwater Sr., at 15 years old. Jim is Luna Loud's friend and enjoys rock music.

In When the Cold Breeze Blows Away, he serves as an assault specialist for the Unified Capitalist Revolutionary Dictatorship People's Ground Force.