In the Ramayana, when Hanuman enters Ashoka Vatika to find Sita, he kills Akshayakumara, one of Ravana's sons. Indrajit (Meghanada) and Kumbhakarna were powerful figures Hanuman fights but does not kill in Ashoka Vatika (Indrajit is defeated later in battle, Kumbhakarna is killed by Rama).