
Arjuna was born in his human form because of his own wish as per the narrative
Udhyoga Parva, Chapter No. 66, Mahabharata CE by BORI, Dr. Bibek Debroy translation
‘Sanjaya said, “Arjuna and Vasudeva are supremely honoured archers. They have everything in them and have been born in this way because of their own wishes
This is another proof of how divine arjun was that it was because of his own wish he took a human form to establish dharma on earth