Mr. Grouse is the Loud family's elderly, curmudgeonly next-door neighbor on The Loud House. As his surname would suggest, he is often annoyed by the noisy antics of the Louds, and sometimes appears to heckle them. He also hates it when the Louds' belongings end up in his yard and is known to confiscate said things as punishment. As much as he finds the Louds annoying, though, he is willing to do favors for the family in exchange for Lynn Sr.'s homemade lasagna. In "11 Louds a Leapin'", it is revealed that Mr. Grouse is crabby because he, like the Loud kids, is from a rather big family himself, but they live far away and he does not often get to visit them.