The Nāgas would be the followers of Virūpākṣa (Pāli: Virūpakkha), on the list of Four Heavenly Kings who guards the western path. They act as guards upon Mount Sumeru, shielding the dēvas of Trāyastriṃśa from attacks via the asuras. The nāga in Indonesia generally derived and motivated by Indic custom, https://128.199.208.170/