About Mekhala and Kanakhala

Mekhala "The Elder Severed-Headed Sister" and Kanakhala "The Younger Severed-Headed Sister") are two sisters who figure in the eighty-four mahasiddhas of Vajrayana Buddhism. Both are described as the disciples of another mahasiddha, Kanhapa (Krishnacharya). They are said to have severed their heads and offered them to their guru, and then danced headless. Their legend is closely associated with the Buddhist severed-headed goddess Chinnamunda.
Dombi Heruka or Dombipa was one of the eighty-four mahasiddhas and student of Virupa. He is usually depicted riding a tiger and holding a snake.

Mahasiddhas – The Siddhi of perfection

is a term for someone who embodies and cultivates the "siddhi of perfection". A siddha is an individual who, through the practice of sādhanā, attains the realization of siddhis, psychic and spiritual abilities and powers. Mahasiddhas were practitioners of yoga and tantra, or tantrikas. The Mahasiddhas are the founders of Vajrayana traditions and lineages such as Dzogchen and Mahamudra. There is a symbiotic relationship between Tantric Buddhist communities and the Buddhist monastic university such as Nalanda .