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J.A.R.V.I.S. (Just a Rather Very Intelligent System) is a fictional character voiced by Paul Bettany in the Marvel Cinematic Universe (MCU) film franchise, based on the Marvel Comics characters Edwin Jarvis and H.O.M.E.R., respectively the household butler of the Stark family and another AI designed by Stark. J.A.R.V.I.S. is an artificial intelligence created by Tony Stark, who later controls his Iron Man and Hulkbuster armor for him. In Avengers: Age of Ultron, after being partially destroyed by Ultron, J.A.R.V.I.S. is given physical form as Vision, physically portrayed by Bettany. Different versions of the character also appear in comics published by Marvel Comics, depicted as AI designed by Iron Man and Nadia van Dyne.

J.A.R.V.I.S. is first introduced in the Marvel Cinematic Universe's films, voiced by Paul Bettany. Modeled after H.O.M.E.R. from the comics, J.A.R.V.I.S. is presented as a sophisticated AI assistant as opposed to a human like his namesake. This was done to avoid similarities to Alfred Pennyworth and Batman. Bettany admits he had little idea of what the role was, even as he recorded it, simply doing it as a favor for Jon Favreau.

The character makes his debut in the 2008 film Iron Man before subsequently appearing in the 2010 film Iron Man 2, the 2012 film The Avengers, and the 2013 film Iron Man 3. J.A.R.V.I.S. is an AI that functions as Tony Stark's assistant, running and taking care of all the internal systems of Stark's buildings and the Iron Man suits. In Peter David's novelization of Iron Man, J.A.R.V.I.S. is said to be an acronym for "Just a Rather Very Intelligent System". J.A.R.V.I.S. also appears in the Disneyland attraction Innoventions.

In Avengers: Age of Ultron, J.A.R.V.I.S. is seemingly destroyed by Ultron, but he was able to save himself by distributing his "consciousness" throughout the Internet, allowing his security protocols to delay Ultron's attempt to access Earth's nuclear launch codes long enough for Stark to work out what had happened. Stark and Bruce Banner use J.A.R.V.I.S. as the core software for the android Vision while F.R.I.D.A.Y. takes his place as Stark's assistant. After gaining a physical body, J.A.R.V.I.S. (as Vision) considers himself to not be J.A.R.V.I.S. anymore, but to simply be Vision.

J.A.R.V.I.S. has not been a contender in any CBUB matches.