
Onomatopoeia is used in this book. Onomatopoeia is the formation of a word from a sound associated with what is named .( bam, pow, sizzle)
"BAMM, BAMM, BAMM".
Onomatopoeia is used to further character development In this case it is the villain. All we know in Batman: Cacophony is that the villain uses Onomatopoeia when he fights. what ever action he does he uses onomatopoeia Since we do not know his identity or why he is doing what he is doing. The author use this poetic device so we can easily identify the character. He also uses it so there is an air of mystery around the villain.