I drew this because apparently I'm not the only one to have this thought.
So, when I first saw Garry, my first thought was "Wow, he looks like Xerxes Break!", because of the purple hair, and the bangs covering the left eye. And later when we manage to see Garry through a mirror, I thought "What's with the seaweed on your hair?", and somehow I nicknamed him "seaweed head", and later I realized that "seaweed head" was the nickname Alice gave Gilbert.
So, yeah, with that combo, there's the hilarious thought: Garry is Break and Gil's son! XD