SB 1.9 - Sudarśana, Śukadeva, Kaśyapa, Āṅgirasa
Some of the great souls who went with Yudhiṣṭhira to see Bhīṣma:
Sudarśana: The wheel of Lord Kṛṣṇa which is more powerful than the brahmāstra. In some Vedic literatures it is said that Agni presented this weapon to Kṛṣṇa but factually this weapon is eternally carried by the Lord. Agni presented this weapon to Kṛṣṇa in the same way that Rukmiṇī was given by Rukma to the Lord. The Lord accepts such presentations even though they are eternally His property. Kṛṣṇa used this to kill Śiśupāla and Śālva.
Śukadeva: The son and disciple of Vyāsa, who taught him first the Mahābhārata and then Bhāgavatam. He recited 1,400,000 verses of the Mahābhārata in the councils of the Gandharvas, Yakṣas and Rākṣasas, and he recited Bhāgavatam for the first time in the presence of Mahārāja Parīkṣit. Śuka inquired from his father extensively about religious principles, and Vyāsa taught him the yoga system, difference between karma and jñāna, the four āśramas, the position of the Lord, the process of seeing Him eye to eye, the bona fide candidate for receiving knowledge etc. Sometimes he went to the sun planet. He is known by different names like Araṇeya, Vaiyāsaki and Vyāsātmaja.
Kaśyapa: One of the Prajāpatis, the son of Marīci and the son in law of Dakṣa. He is the father of Garuḍa. He married 13 daughters of Dakṣa and begot many children both demigods and demons. From Aditi, the 12 Ādityas were born; one of them is Vāmana. He received a presentation of the whole world from Paraśurāma, and later on he asked Paraśurāma to go out of the world.
Āṅgirasa: He is the son of the sage Aṅgirā and is known as Bṛhaspati, the priest of the demigods. He challenged Śukrācārya, the spiritual master of the demons. He begot six sons by his wife Candramāsī and could travel in space. Once he cursed Indra to become a hog.