Question: What is the real name of the serial killer that the film Pulan Visaranai is loosely based on?

Context paragraphs:
Honest Raj: Honest Raj is a 1994 Tamil language action film directed by K. S. Ravi.  The film features Vijayakanth, Gouthami, Aamani and Devan in lead roles.Through this film Devan gain fame in negative roles in Tamil Film industry.  It marked the debut of Ravi K. Chandran in Tamil cinema.  The film, produced by Thiagarajan had music composed by Ilaiyaraaja released to positive reviews on 14 April 1994.  It was dubbed in Telugu as "Police Commando".  The film's title is taken from Vijayakanth's earlier film, "Pulan Visaranai".

Pulan Visaranai: Pulan Visaranai (English: Investigation ) is a 1990 Tamil language film directed by R. K. Selvamani.  The film features Vijayakanth in lead role.  The film, produced by R. Sundar Raj and S. Raveendran, had musical score by Illayaraja and was released on 14 January 1990.  The film was a blockbuster and was considered to be one of the best crime thrillers of its time.  It was remade in Hindi as "".  The character of the antagonist Dharma (played by Anandaraj) is loosely based on the serial killer Auto Shankar.  Telugu dubbed version "Police Adhikari" was also successful.

Lalitha Kumari: Lalitha Kumari is an Indian film actress who is the daughter of Tamil actor C. L. Anandan, who starred in many films, such as "Vijayapuri Veeran" and "Kaattumallika" and the younger sister of Disco Shanthi.  She has starred in many movies in the early nineties with the likes of Goundamani, Senthil and other senior actors.  She has also played major roles in films like ‘Manadhil Urudhi Vendum’, ‘Pudhu Pudhu Arthangal’, ‘Pulan Visaranai’ and ‘Sigaram’.  Lalitha Kumari has performed in more than 30 films and has made her mark in Tamil industry.

Ravan Raaj: A True Story: Ravan Raaj: A True Story is a 1995 Hindi-language Indian feature film directed by T.Rama Rao, starring Mithun Chakraborty, Madhoo, and Aditya Pancholi and is centred on kidney smugglers and a serial killer.  The film is a remake of Tamil blockbuster Pulan Visaranai starring Vijayakanth.  It was a Hit film at the box office.

Henry: Portrait of a Serial Killer: Henry: Portrait of a Serial Killer is a 1986 American psychological horror crime film directed and co-written by John McNaughton about the random crime spree of a serial killer who seemingly operates with impunity.  It stars Michael Rooker as the nomadic killer Henry, Tom Towles as Otis, a prison buddy with whom Henry is living, and Tracy Arnold as Becky, Otis's sister.  The characters of Henry and Otis are loosely based on real life serial killers Henry Lee Lucas and Ottis Toole.

Auto Shankar: Auto Shankar (January 21, 1954 – April 27, 1995) is the nickname of Indian serial killer Gowri Shankar.

Pulan Visaranai 2: Pulan Visaranai 2 is a 2015 Tamil language film directed by R. K. Selvamani and produced by Ibrahim Rowther.  It stars Prashanth, Karthika in lead roles with R. K. and Pyramid Natarajan playing pivotal roles.  The film which was a sequel to 1990 film "Pulan Visaranai" began production in 2006 and went through production troubles before releasing on 30 January 2015.

Perarasu (film): Perarasu (2006) is a Kollywood Tamil film starring Captain Vijayakanth, Debina Bonnerjee, Nassar, Sarath Babu, and Prakash Raj with music composed by Praveen Mani.  The film is directed by Udhayan.  This movie is a typical unadulterated masala movie with a good-cop-versus-bad-guys story.  "Perarasu" is similar to several earlier films of Vijayakanth, like "Vallarasu" and "Pulan Visaranai".  He can be seen in every frame.  He plays a dual role as a law enforcer and a terminator.  The action scenes are mainly flying kicks with no blood and gory scenes.

Cold Fish: Cold Fish (冷たい熱帯魚 , Tsumetai Nettaigyo ) is a 2010 Japanese horror-drama serial killer film directed by Sion Sono.  The film is about a quiet and unambitious owner of a tropical fish shop whose life and family are taken over by a fellow fish entrepreneur who happens to be a serial killer.  The film is loosely based on the exploits of two Tokyo serial killers, Sekine Gen and Hiroko Kazama, a husband and wife duo who owned a pet shop and murdered at least four people.

The Long Island Serial Killer (film): The Long Island Serial Killer (also known as The Gilgo Beach Murders) is a 2013 American true crime horror film loosely based on the elusive Long Island serial killer who murdered seventeen women on Long Island between 1996 and 2010.

Supporting paragraphs: Pulan Visaranai Auto Shankar
Answer: Gowri Shankar