This Being is not the god of the fire, he is not an Asura. Nor is he a Naga. he is a Brahmana who has attained to heaven on account of his having been crowned with success in the observance of the vow called Unccha.
सूर्य उवाच नैष देवोऽनिलसखो नासुरो न च पन्नगः। उच्छवृत्तिव्रते सिद्धो मुनिरेव दिवं गतः॥