Place it right after the reveal that sets up the fight, then let a dramatic theme take over for the battle that follows. Pair it first with Giorno Giovanna's Theme for the build-up, and close the sequence with Za Warudo Time Stop when the action freezes.
Über diesen Sound
This is a short Japanese voice line, just under two seconds, in which a speaker reacts to Broly with stunned disbelief, saying what a guy he is. The delivery is sharp and incredulous, giving it a startled, almost awestruck feeling that lands as a comic reaction to overwhelming power. It comes from Dragon Ball, where Broly is the immensely powerful Saiyan warrior.