An asura. One of the 40 danavas born to Kashyapa and Danu as per Mahabharata Adiparva Chapter 65.

Once, during the deva-asura war, the devas suffered huge casualties and Keshi tried to capture two daughters of prajapatis – Daityasena and Devasena. Daityasena went with him willingly, but Devasena resisted, shouting, and this brought Indra running. There was a fierce battle between Keshi and Indra and finally Keshi fled as per Mahabharata Vanaparva Chapter 223.

Once Keshi and Vishnu fought for thirteen days as per Mahabharata Vanaparva Chapter 134 verse 20.