Here is the description of some of the demons killed by Lord Hanuman , Sugreeva and Angada from Valmiki Ramayana Yuddha Kanda . Lord Hanuman killed Nikumbha.Sugreeva kills Virupaksha and Angada Killing Narantaka .
Book VI : Yuddha Kanda - Book Of War Chapter 77 -Nikumbha dies at the hands of Hanuma.
अथ निनदति सादिते निकुम्भे | पवनसुतेन रणे बभूव युद्धम् |
दशरथसुतराक्षसेन्द्रसून्वो | र्भृशतरमागतरोषयोः सुभीमम् || 6.77.23||
tha ninadati saadite nikumbhe | pavanasutena raNe babhuuva yuddham
|
dasharathasutaraakShasendrasuunvo | rbhR^ishataramaagataroShayoH
subhiimam || 6-77-23||
Then, while the roaring Nikumbha was killed in battle by Hanuma, there
ensued an exceedingly terrific struggle between the enraged Rama and
Makaraksha, son of Khara, a ruler of demons.
VI : Yuddha Kanda - Book Of war - Chapter 96 - Sugreeva kills Virupaksha.
विनाशितं प्रेक्ष्य विरूपनेत्रं | महाबलन् तन् हरिपार्थिवेन |
बलन्
समस्तन् कपिराक्षसानाम् | उन्मत्तगङ्गाप्रतिमं बभूव || 6-96-36||
vinaashitaM prekShya virUpanetraM | mahaabalan tan haripaarthivena
|
balan samastan kapiraakShasaanaam | unmattaga~NgaapratimaM
babhUva || 6-96-36 ||
Beholding that mighty Virupaksha killed by Sugreeva, the army of
monkeys and demons together looked like the agitated river of
Ganga.Beholding that mighty Virupaksha killed by Sugreeva, the army of
monkeys and demons together looked like the agitated river of Ganga.
VI : Yuddha Kanda - Book Of Chapter - 97 -Verse 33 -Mahodara killed by Sugreeva.
लग्नमुत्कर्षतः खड्गन् खड्गेन कपिकुञ्जरः |
जहार सशिरस्त्राणन्
कुण्डलोपहितन् शिरः || 6.97.33||
lagnamutkarShataH khaDgan khaDgena kapiku~njaraH
jahAra
sashirastrANan kuNDalopahitan shiraH | ||6-97-33||
Even while Mahodara was extracting his sword which had got struck in
the shield, Sugreeva severed with his own sword, Mahodara's head,
which was adorned with ear-rings and helmet.
Book VI : Yuddha Kanda - Book Of War - Chapter - 69 - Angada Killing Narantaka .
थदान्तरिक्षे त्रिदश उत्तमानाम् | वन ओकसाम् चैव महा प्रणादः |
बभूव
तस्मिन् निहते अग्र्य वीरे |नर अन्तके वालि सुतेन सम्ख्ये || 6.69.95||
thadaantarikSe tridasha uttamaanaam | vana okasaam caiva mahaa
praNaadaH | babhuuva tasmin nihate agrya viire |nara antake vaali
sutena samkhye || 6-69-95 ||
When that Narantaka of great prowess was killed by Angada in
battle, the chiefs of celestials and the monkeys too then emitted a
great roar of triumph in the sky.
Book VI : Yuddha Kanda - Book Of War -
Chapter 67 - Verse 177 -
Lord Rama Kills Kumbhakarna
स देवलोकस्य तमो निहत्य |सूर्यो यथा राहुमुखाद्विमुक्तः |
तथा
व्यभासीद्धरिसैन्यमध्ये | निहत्य रामो यधि कुम्भकर्णम् || 6-67-177||
sa devalokasya tamo nihatya | suuryo yathaa raahumukhaadvimuktaH |
tathaa vyabhaasiiddharisainyamadhye | nihatya raamo yadhi kumbhakarNam
|| 6-67-177||
Having destroyed Kumbhakarna in battle, that Rama shone in the midst of the army of monkeys, in the same way as the sun shines in the
midst of the celestial world, having destroyed darkness, duly getting
delivered from the mouth of Rahu.
Book V : Sundara Kanda - Sarga 47 - Lord Hanumana kills Aksha (Ravana's own son)
निहत्य तम् वज्र सुत उपम प्रभम् | कुमारम् अक्षम् क्षतज उपम ईक्षणम् |
तत् एव वीरो अभिजगाम तोरणम् | कृत क्षणः काल इव प्रजा क्षये || ५-४७-३८
Killing that Aksha, possessing a lustre equal to that of Jayanta the son of Indra the lord of celestials and having his eyes resembling blood, the heroic Hanuma reached the same archy door way again, like Yama the lord of death expecting in a moment any mortal getting destroyed by him.
Book VI : Yuddha Kanda - Sarga 91 - Lakshmana kills Indrajit or Meghanada (Ravana's own son)
रुधिरक्लिन्नगात्रस्तु लक्ष्मणः शुभलक्षणः |
बभूव हृष्टस्तं हत्वा शक्रजेतारमाहवे || ९१-६-१
Lakshmana, endowed with auspicious bodily marks, whose limbs were
drenched in blood, felt rejoiced on having killed Indrajit in combat.