Sudalai Madan

Madan is a deified hero known to have performed rites in temples and in graveyards who is generally by Tamil people in South India, particularly in southern Tamil Nadu, like Thirunelveli, Thoothukudi, Kanyakumari districts and southern Kerala. However, anthropological studies show evidence of native Tamil origin of Sudalai Madan. According to one mythological story, He was created by Lord Shiva, means protector and "sudalai" means cemetery or burial ground. He is the eradicator of evil forces and bridles evil forces. Evil forces are believed to emanate from cemeteries and burial grounds. Sudalai reigns over evil forces, so Sri Shiva thus dubbed him as "Sudalai Madan". Sudalai is also termed as the "Kaval Deivam", or the protecting deity. Sudalai Madan is paramount of the protecting deities. Sudalai Madan is often termed as "Maharaja". In central to southern Kerala, he is known as "madan thampuran", "chudala madan" or simply as "madan".
Sudalai Madan temple in Pozhikarai Village cheranmahadevi 
(popularly known as Pozhikarai Mayandi) alongside the banks of river Thamirabarani and a temple in Sirumalanchi near Valliyor in Tirunelveli district are considered more powerful temples in south Tamil Nadu
There are others deities with the name Madan, but Sudalai Madan is the supersedes all of them. Sudalai is generally considered a rural deity. In the Tamil language, this is referred to as a "ooru kaval".
He is mostly with mother goddess Pechiamman (a form of Kaali), Brahmasakthi Amman and his brother Sudalai Mundan. Madathi is the consort of Sudalai Madan.
Whoever acts against dharma cannot escape from Sudalai Madan. Sudalai Madan will never forgive anyone who is harming his devotees. One has to be pure at his heart and actions to become a devotee of Sudalai Madan. 
There is the belief that Sudalai is the guardian of the Kodimaram (Flagstaff) in every temple.
Temples.
Temples of Sudalai Madan are
Arumuganeri 
Kidangankaraivilai, 
Kanniyakumari 
district. 
Arulmigu Athiadi Sudalaimadan kovil, athiputhur, Tirunelveli Dt.
Sudalai Kovil, Palazvur, Tirunelveli
History of Sudalai.
There is no written script for Sudalai Madaswamy. But the history is vocally transferred from ancient. There are many stories which tell about the birth of Sudalaimadan.
Born in Kailash by penance of Parvathi is first birth.
Another story about Sudalai Madaswamy tells of his birth on Kailasa, the mountain home of Siva and Parvathi. It is said that Devi Parvathi wanted a child, but Lord Siva had sworn celibacy. He had promised to be chaste at the request of the gods since they had feared that his union with Parvathy would be so powerful it would shatter the universe. Siva suggests another way to have a child. He tells Parvathy to go and do penance in Ayiramkal Mandapam (Place having 1000 pillars in Kailash). Parvathi did penance. Shiva was happy about that. Then he plucked his hair, it started to burn as soon as he plucked and threw in that place. The fire spread on her mundanai (a part of saree). From the fire, Sudalai Madan is born.
Parvathi initially feeds the child on Amrita (the nectar of immortality), instead of on breast milk. So it is said that the child became immortal. However, the child also became desirous of solid food. He went to the cremation grounds ("sudalai") on Kailasa and began to eat the burning corpses.Since he had such a fondness for meat, it was decided that he ought not to remain in Kailash. Siva instructed him to go to Earth and to care for its people. Siva proclaimed that Sudalai Madan's protection and kindness would be re-paid with offerings of cooked food and drink, and thus he would always have a meal, as well as people who would pray to him. So Sudalai Madan came to earth, accompanied by a number of singers and dancers who were sent by Siva to see to his worship.
Worship.
Often Sudalai Madan statues are triangular pillar-like structure and figured statues are stone carved. He is either in open or under a simple roof. The devotees serve non-vegetarian foods to him. Goats, chickens, and pigs are sacrificed and served to him. Fridays are optimum for Sudalai Madan. Special poojas are conducted every last Fridays of Tamil months and yearly once or twice main festivals are conducted for Sudalai Madan. These festivals are called "Kodai". Kodai is celebrated for one day to many days according to the devotees need. Some famous temples celebrate it for 10 days.
On these occasions, the deities are fully decorated with flowers. Some people get possessed on God and devotees talk to God through them. God goes for hunting in the cemetery through this spiritually possessed person. Art forms of Thappattai beats, Kaniyan Koothu (Maguda Kacheri) and Villupattu are main performances of Sudalai Maadan Kodai festival.
There is a famous Sudalai Madam deity or a person who perceived the spiritual power of Lord Sudalai Madan in K. K. Nagar, Chennai who would directly speak to Sudalai Madan and convey it back to the devotees. When there is theft Sudalai Madan will let this deity know and help to find the lost objects.
Sudalai Madan Temple function (Kovil Kodai) is very famously celebrated every year in Avudaiyanoor Near Pavoorchatram, Tenkasi Taluk, Tirunelveli District.
Outside India.
Madan is also popular amongst certain segments of the Tamil diaspora in Sri Lanka, Singapore, Malaysia, Réunion and the French overseas territories in the Caribbean sea.
In popular culture.
The 1992 Tamil movie Chinna Thayee has a character which is spiritually possessed by this god.