Voice reference : https://www.youtube.com/watch?v=WNNSSblZ2Dc

In HEADSPACE, BASIL is a medium-height boy with pale skin, teal eyes, mint green chin-length hair, and wears a purple-blue and pink flower crown. He wears knee-length denim overalls with a large pocket on the chest and a yellow button-up shirt under. He doesn't wear any shoes.

In the real world, he has blond hair and has a single pink flower tucked behind his left ear. He wears a green knitted sweater vest over a white button-up shirt, beige shorts, and black shoes, resembling the same clothes that SUNNY wears. He also appears shorter than most of his friends, being as tall if not shorter than SUNNY.