ONE PIECE Volume 75 "My Return"

Luffy follows Doflamingo to the royal palace again. Suddenly blocking his path was Pika, a leader of the Don Quixote Pirates and a Ishiishi fruit who has the ability to assimilate stones and rocks. By assimilating with the rocks around him, he stands in front of him as a "rock giant", but in fact, he has a high voice that you can't imagine from his appearance.

As soon as Luffy hears the voice, he starts laughing involuntarily, and Pika's fist, which trembles with anger, swings down ...!

It is precisely because the tone of the voice, which is difficult to express in manga, is created that we are drawn in.