Maureen's title of "weirdest Always Sunny supporting player" is no small feat, but when you think about how she progresses from a cute girl with one obvious flaw to a deranged cat person, it's pretty undeniable. Maureen is first introduced as a former classmate that Dennis and Dee went to high school with, and though Dennis is generally attracted to her, there's one problem: she has a "dead tooth."
However, after Dennis repeatedly emotionally tortures Maureen and breaks her heart multiple times, Maureen has the weirdest possible reaction, and decides to transition... into a cat. Throughout the series, every time Maureen appears, she's more and more dedicated to becoming a human-cat hybrid — though her love for cats was once confined to her love for arts and crafts, as the show progresses, Maureen starts adopting the mannerisms of actual cats, and even getting plastic surgery to look more like a cat. Shortly before Maureen dies under mysterious circumstances — though it's fairly obvious that Dennis is behind her murder — she has fully transitioned into a cat, hissing, meowing, and obsessively following laser pointers.
Maureen ultimately meets a tragic end, but while she's alive, there's really no question that she's the absolute weirdest character on the show. It's Always Sunny in Philadelphia, which currently spans fourteen seasons, is available to stream on Hulu now.
