1.) Lord Ram :
The complete manifestation of Vishnu who killed powerful demons like Tarakasura, Viradha, Kabandha, Maricha and Subhahu in Dandaka forest with support of Lakshmana. Killed Khara, Dhoosana along with 14000 rakshasas in Janasthana single handedly. He possessed the power to annihilate armes of any size single handedly. Defeated and killed the greatest threat to the gods Ravana and Kumbhkarana. Defeated Ravana thrice before killing him in the fourth attempt. Killed Vali with a single arrow.
2.) Lord Hanuman :
Like Rama he too had the power to obliterate armies of any scale. He was the incarnation of Shiva and was immune to all celestial weapons due to Brahma,’ s boon. He had the unique power to choose the time of his death. Defeated Ravana with a single punch. Broke the mighty spike of Kumbhkarana by which he defeated Indra and Yama and overpowered him heavily making him flee from the fight. Infalliable Brahmashirastra of Meghnad which killed 67 crore vanaras had no effect on Hanuman.
3.) Lakshmanji :
He was the complete incarnation of Sheshnag who is also regarded as a form of Vishnu. He killed demons like Indrajit and Atikaya in combat and aided Rama in killing thousands of demons capable of invoking deadly illusions. Overpowered Ravana twice in plain archery once even with his Brahma armour. He tormented Kumbhkarana with his arrows who was unscathed even by Indra,’ s Vajra. Could have killed Ravana, Indrajit and the entire rakshasa army using Brahmastra had Rama not stopped him.
4. Bhagwan Parshurama :
He was the partial incarnation of Vishnu who had bested Kartavirya Arjuna in combat. He was the direct pupil of Mahadev and recieved all celestial weapons from him including Trishul and weapons of Trinity i.e Pashupatastra, Vaishnavastra and Narayanastra. Wiped the kshatriyas clean of earth 21 times with his Vijaya bow. With his invincible axe, Parshurama eliminated literally 100 "Akṣauhiṇis" soldiers who were guarding Kartivirya Arjuna.
5. Kartavirya Arjuna :
He was the incarnation of Sudharsana chakra and disciple of Dattatreya. He remained an undefeated warrior before facing Parshurama. Kartavirya Arjuna had defeated Indra and the 33 gods riding on a single chariot. He had defeated Indra and humiliated him in front of his wife Sachi devi. He had boon of all time invincibility except Vishnu. Kartavirya,’ s greatest achievement was defeating and capturing Ravana. He was strong enough to stop the flow of river Narmada using his arms.
6. Indrajeet :
The eldest son of Ravana and a master of scorcery and black magic. No one can defeat Indrajit once he finishes Nikumbhala sacrifice. He after completing Nikumbhala sacrifice single handedly knocked out Rama, Lakshmana and the entire vanara army unconscious and killed 67 crore vanaras using infalliable Brahmashirastra. Defeated and captured Indra in battle hence was named Indrajit. Fought a terrific battle with Lakshman for three days. During the final stages of the battle between Indrajit and Lakshmana , Indra along with all the celestial gods protected Lakshmana.
It needed aindrastra with the name of lord Rama to defeat and kill indrajit.
7. Ravana :
The mighty king of Lanka who defeated Indra and 33 gods in group attack and tanked Indra’s vajra and Vishnu’s disc. Overpowered Hanuman in direct combat and In the war with Ram, he defeated Sugriva and other vanaras like Nila. He was a marksman of every divine missile and possessed Brahma armour, Pashupatastra, Brahma shakti etc. Overall he was the most powerful demon if we consider both physical strength and weapons but Indrajit,’s boons give him the edge. He was stronger than Lord Lakshmana and could defeat him if you remove divine nature of Lord Lakshmana.
8. Atikaya :
Atikaya was the son of Ravana and an excellent archer and warrior who inflicted terror among vanaras by his mere presence. He was extremely destructive in battlefield. Atikaya countered Indra’s Vajra and Varunapasha with his ordinary arrows. He put up a good might with Laxmana. He was invulnerable to all of Laxmana’s arrows as he gained the Brahma Kavach and even made Laxmana unconscious with a snake arrow.
9. Kumbhkarana :
Physically Kumbhkarana was the strongest rakshasa from Ravana,’ s sid. He vanquished Indra by his brute strength and crushed him. Defeated Yamraj and other gods by his mighty spike. He struck Hanuman with his spike and made him vomit blood. Crushed both Angad and Sugriv in battle. The arrow which killed Vali didn’t harm Kumbhkarna at all. It took Rama four celestial weapons including Roudrastra, 2 Aindrastra and Vayavyastra back to back to kill Kumbhkarana. Roudrastra of Rama had no effect on him.
10. Vali :
He was the son of Indra and a very powerful vanara empowered by Brahma,’ s boon who had bested Sugriva in wrestling combat. Defeated Ravana and dragged him across four oceans by holding him in his armpits. Killed powerful demons like Mayavi and Dundhubi who was even feared by Varun deva and Himavat mountain.