The Lord always exists in different transcendental forms. As stated in Brahma-saṁhitā (5.39):
rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan
nānāvatāram akarod bhuvaneṣu kintu
kṛṣṇaḥ svayaṁ samabhavat paramaḥ pumān yo
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
The Lord is situated as Himself, Lord Kṛṣṇa, the Supreme Personality of Godhead, and He is accompanied by His expansions like Lord Rāma, Baladeva, Saṅkarṣaṇa, Nārāyaṇa, Mahā-Viṣṇu and so forth. The devotees worship all these forms according to their liking, and the Lord, out of His affection, presents Himself as arcā-vigraha. He sometimes presents Himself personally before the devotee out of reciprocation or affection. A devotee is always fully surrendered to the loving service of the Lord, and the Lord is visible to the devotee according to the devotee’s desires. He may be present in the form of Lord Rāma, Lord Kṛṣṇa, Lord Nṛsiṁhadeva and so on. Such is the exchange of love between the Lord and His devotees.