Louisa was a minor villain on Friends. She appeared only in the episode The One Where the Monkey Gets Away, attempting in vain to recapture the titular simian.
She was portrayed by Megan Cavanagh.
She is an animal cop who tries to find Marcel. She's a tomboy for sure (and it might be implied that she is or was a lesbian, and there are some implied remarks about her for being a tomboy; Rachel was unwelcoming to her on several occasions). She is portrayed as evil and mean.