Remorseless, treacherous, lecherous, kindless做定语修饰villain
这是押韵 rhyme & rhyming
押头韵是alliertation, the repeating of the same letter (or sound) at the beginning of words 。
可能是Assonance: is more or less the direct opposite of alliteration. This is the repetition of vowel sound in two or more words in lines of poetry。仅供参考。