Asura · All traditions · Pan-India
Rahu
The asura Svarbhanu who drank the nectar in a god's disguise, was exposed by the sun and moon and beheaded by Mohini's discus; the immortal head is Rahu, the body Ketu, and their grudge explains eclipses.
Sources: Samudra Manthana — Wikipedia · see Rahu's web