Andhaka - a malevolent asura famed for having a thousand arms, a thousand heads, and twice as many eyes. Some say it's two thousand arms!
His name means "He who darkens" in some versions of the story, he is the son of Shiva and Parvati
In the Shiva Purana, Shiva is meditating and Parvarti covers his eyes in a playful moment of goofing around.
When she covers his third eye, she recoils from its power and it brings sweat to her palm that falls to the groundfrom that meeting of his third eye and her palm/sweat - the drop of sweat that falls to the ground becomes a dark boy who is born blind and ugly to Parvati.
Shiva chastised her on this in that since the child came into creation from their touches meeting, the child is theirs and should be cared for.
Later Hiraṇyākṣa the demon performed a penance in hopes of gaining a boon from Lord Shiva, in this case, to have a son, in which he is gifted the blind boy who is named, Andhaka. After Hiraṇyākṣa is killed, Andhaka is considered the demon king however, since he was born of devas, he is not considered by others an asura, and so he pleads with Brahma (the creator) after being disowned by his tribe - he is granted the boon to become immortal, but Andhaka is warned Shiva can still destroy him he leaves to subdue all his opponents among the asuras and take charge. Later he wages a war against the gods after he contemplates attacking Mount Mandar where Shiva meditates.
During this war, Bali, Andhaka's trusty general, defeats and swallows most of the gods. But Shiva fires a bolt at bali forcing him to regurgitate the gods, and in vengeance swallow Sukra, the guru of the Asuras. Then Shiva and Indra set upon Andhaka, making him bleed only, every drop of his blood spawned more copies of him, so Vishnu created the Matrikas to absorb the blood every time it spilled so no copies could be born.
This is one of the accounts and just a primer of a cool character, I want to do more of these more often, so I figured I'd just start with cool South Asian character--good, evil, neutral, whoever, whatever, cuz there are so many fucking awesome stories.