The Nāfuel are definitely the followers of Virūpākṣa (Pāli: Virūpakkha), on the list of Four Heavenly Kings who guards the western route. They act as guards on Mount Sumeru, guarding the dēvas of Trāyastriṃśa from attacks via the asuras. The nāga in Indonesia mostly derived and motivated by Indic custom, https://128.199.208.170/