Dronacharya served as the esteemed teacher for both the Kauravas and Pandavas, with Arjuna being his favourite student. Ashwatthama is the son of Drona.
Karna is a naturally armored child and born as an incarnation of Sun God due to the boon of Kunti Devi. Karna died at the hands of his own brother Arjuna.
Ghatotkacha was the son of Bhima. While in exile, Hidimbi, a demoness, fell in love with Bhima and Kunti agreed for their marriage.
On the instruction of Lord Krishna, Bhima splits Jarasandha's body into two parts and throws them in opposite directions, killing Jarasandha.