Monica Geller would eventually become popular staples of the show. Several months before "Friends" premiered, NBC had conducted a research report, the results of which determined that Monica was the only character to have been remotely well received by test audiences. When "Friends" first aired, critics initially perceived Monica – who was immediately established as the show's "mother hen" – and Cox as the series' main character and star, respectively. Critics have been largely receptive towards both Cox and her character; the "Los Angeles Times" holds Cox's acting responsible for disproving the stigma that attractive women are incapable of delivering comedic performances.
Monica Geller Monica and Ross' "wacky quirks become all the more understandable after ... seeing them with their parents." "Encyclopedia of Television Shows, 1925 through 2010" author Vincent Terrance believes that Monica's competitiveness originates from having grown up with Ross as a brother, against whom she often competed as a child. Kriti Tulsiani of IBNLive described Monica and Ross' relationship as "A blend of love and sibling jealousy with an urge to irritate each other to the deepest core of existence", with Ross often making fun of his sister's weight and Monica teasing him about his several failed marriages in return. In