Ruth is one of the great-aunts of the Loud kids. Every time they go to visit her, she forces them to watch her cats, eat old moldy pudding that she offers, and to massage her feet. For this reason, none of the Loud kids (other than Lana) enjoy visiting her. Since Aunt Ruth worries that Lily won't behave herself, Lincoln's father typically babysits her when the rest of the family pay a visit.
She first appears in "Two Boys and a Baby", where Lincoln avoids going to her house, by offering to babysit Lily, while Lynn Sr. goes to Ruth's, which Rita accepts, much to Dad's chagrin. At the end of the episode Lincoln, Clyde and Lily come into contact with a kid who gets chicken pox, and must stay in Ruth's house, who also has had chicken pox, where Lily is surprisingly shown to be enjoying herself while Lincoln and Clyde suffer.
She is later mentioned in "Suite and Sour", where once again the Loud Kids dread the thought of going to her house.
She is mentioned in "Brawl in the Family", when Lincoln tells Leni that the dress she brought makes her look like aunt Ruth.
In "Friend or Faux?", Lori mentions that she got a hand-me-down from her.
In "No Spoilers", she was seen attending her niece's party.
In "Selfie Improvement", she was mentioned by Lori liking her selfie.
In "Ruthless People", it is revealed that Ruth has a lake house which she got in a timeshare.
In "Any Given Sundae", when Lynn Sr. gives Lily his phone, he tells her not to call Aunt Ruth.
In "Sister Act", Lynn Sr. mentions visiting Ruth as an examples of things he dislikes doing, but has to.
Ruth is a lazy slob and big eater. She loves her cats and cares for them a lot. She enjoys watching her old photographs, and makes others watch them no matter if they like it or not. She also makes her guests eat an old moldy pudding. She also enjoys when Lincoln gives her foot massages.
Ruth is a very big and round woman. She has long, brown hair worn up in a bun often, and bunions on her feet. She also appears to be somewhat overweight, and it looks like she hardly ever gets off her couch. On her left foot, she abnormally has an extra toe. She wears an olive green dress with sunflower prints.