Mahāprabhu gave Pradyumna Brahmacārī the epithet Nṛsiṁhānanda because of his absorption in the service of Nṛsiṁha. He is considered to be one of Caitanya’s own branches. (Caitanya Caritāmṛta 1.10.35, 3.2.53)

Pradyumna Brahmacārī considered himself to be the servant of Nṛsiṁha for Nṛsiṁhadeva manifested Himself in his body. He remained by Mahāprabhu’s side in the consciousness that Nṛsiṁha Himself had appeared in the form of a sannyāsī. (Caitanya Bhāgavata 3.3.286-7)

Vṛndāvana Dāsa Ṭhākura writes in the Caitanya Bhāgavata that Pradyumna Brahmacārī conversed directly with Nṛsiṁhadeva. This is mentioned in relation to when Pradyumna Brahmacārī joined all the devotees on the annual pilgrimage to Jagannātha Purī.

Pradyumna Brahmacārī, who talked directly to Lord Nṛsiṁha, walked along as a part of the company of devotees. (Caitanya Bhāgavata 3.8.92)

All those people who think that the body of the Lord is a product of the material nature are atheists who have been bewildered by the Lord’s illusory energy. They think that these accounts are tall stories they can criticize out of their false sense of being learned. Anyone who lacks faith in the Supreme Lord is an unfortunate beggar who remains deprived of the actual welfare, and who gains nothing but repeated births and deaths.

When Mahāprabhu took sannyāsa in Katwa, he immediately started for Vṛndāvana, but Nityānanda Prabhu tricked him into coming back to Śāntipura on the banks of the Ganges. Afterwards, the Lord continued to Purī in the company of Nityānanda Prabhu, Jagadānanda Paṇḍita, Mukunda Datta and Dāmodara Paṇḍita. Shortly thereafter, He left Purī on a pilgrimage through South India. On His return, He planned a trip to Vṛndāvana that would take Him on the route along the Ganges through Bengal. On this trip, He stopped at the house of Sārvabhauma Bhaṭṭācārya’s brother, Vidyā Vācaspati, in Vidyanagar, delivered Devānanda Paṇḍita and Gopāla Capala from their offences in Kuliya village, and then met Rūpa Gosvāmī and Sanātana Gosvāmī in the village Ramakeli.

As Mahāprabhu made this trip, Pradyumna Brahmacārī, in his meditation, visualized himself placing jewelled bricks on the road the Lord was following to make His journey more agreeable. When the Lord reached Kanair Natshala, about 202 miles from Kolkata in the Santal Paragana in Dumka district of Bihar state, five miles from the town of Rajmahal, Pradyumna could not prepare the road further as his meditation suddenly broke. He was immediately able to understand that the Lord would only go as far as Kanair Natshala on this occasion and no further.

It is said that mental service like that performed by Nṛsiṁha Brahmacārī in this meditation is superior to service performed with actual ingredients. There is evidence of this in Purāṇas, which cite the example of a poor brāhmaṇa from Pratishthanpur who attained the association of Nārāyaṇa in Vaikuṇṭha as a result of mental service or mānasī sevā.

On one occasion, Mahāprabhu was attracted by Nṛsiṁhānanda’s love to come to Kumarahatta and to appear in the house of Śivānanda Sena. This story has been told beautifully by Kṛṣṇadāsa Kavirāja Gosvāmī in his Caitanya Caritāmṛta, Antya-līlā, Chapter 2.

One year, as Śivānanda Sena’s nephew Śrīkānta Sena left Purī, Mahāprabhu told him to convey the message to the Bengali devotees that there was no need for them to come to Purī that year, for He Himself would be visiting Bengal in the month of Pauṣa (December-January). When Śrīkānta came with this news, all the devotees were jubilant in expectation of the Lord’s visit. But when the month of Pauṣa had almost come to an end and there was no sign of Mahāprabhu, Śivānanda Sena, Jagadānanda Paṇḍita and the others who had been waiting anxiously were disheartened by not seeing Him.

At that time, Nṛsiṁhānanda happened by and asked everyone the reason for their unhappiness. When he heard that they were disappointed that the Lord had not come, he assured them that he would make Mahāprabhu appear there on the third day. Since Śivānanda and Jagadānanda knew Nṛsiṁhānanda’s spiritual powers, they believed him.

Nṛsiṁhānanda sat down and stayed absorbed in meditation for two days, after which he told Śivānanda that Mahāprabhu had arrived in Panihati and that by noon of the next day He would be in Śivānanda’s house. He ordered Śivānanda to supply him with the ingredients for a feast in honour of the Lord. He personally started cooking early in the morning and made a large variety of preparations that he distributed onto three plates to make offerings to Lord Jagannātha, Nṛsiṁhadeva and Mahāprabhu. As soon as he sat down in meditation for the offerings, Mahāprabhu personally appeared and ate all three plates, leaving no remnants.

Although Nṛsiṁhānanda was overjoyed to see the Lord accept his offerings, he made a pretence of disappointment. He said, since Mahāprabhu and Lord Jagannātha are ontologically non-different, there was no fault in His eating the plate set out for Lord Jagannātha. But why had He taken the offering intended for Nṛsiṁha? “Nṛsiṁhadeva has fasted today,” he said. Indeed, the Lord performed this pastime in order to show that He is not different from Lord Jagannātha or Nṛsiṁhadeva.

After eating, Mahāprabhu left for Panihati. Nṛsiṁhānanda cried out in distress, causing Śivānanda to inquire the cause of his troubles. Nṛsiṁhānanda answered that the Lord had alone eaten all three plates, leaving Lord Jagannātha and Nṛsiṁhadeva to fast. Śivānanda had some doubts, but on his request provided him with foodstuffs to prepare another offering. The Brahmacārī cooked once again and made an offering to Nṛsiṁhadeva.

The next year, when Śivānanda went with the Bengali devotees to Purī, everyone was duly astonished to hear the Lord Himself volunteer the information that He had been to Śivānanda’s house in the month of Pauṣa and had eaten the delicious offerings made by Nṛsiṁhānanda.

One day, the Lord was engaged in conversation in the presence of all the devotees and suddenly began to praise Nṛsiṁhānanda’s qualities. He said, “Last year in the month of Pauṣa, Nṛsiṁhānanda gave Me delicious sweetmeats and vegetables that I had never eaten before.” Hearing this, all the devotees were struck with wonder and Śivānanda was finally convinced that the incident was true. (Caitanya Caritāmṛta 3.2.76-78)