Garth resembles a Caucasian teenager, with black hair, purple eyes and a slender build. His hair is relatively long, but a portion of it is caught up in a ponytail at the point of his back of the head, and the rest comes down to the nape of his neck and jawline. He wears a skin-tight swimsuit that exposes his arms and legs. It is predominantly blue-gray, although on the torso it has a midnight blue vest-shaped design, with azure lines tracing its edges and collar area. Around his waist, he dons a matching belt with attached tassets hanging down over his upper thighs. He also wears midnight blue bands around his forelimbs.
1990's: Garth is born.
2011: Garth joins Young Justice.
- Breathe Underwater
- Gills on his neck
- Can feed drowning oxygen
- Enhanced Strength
- Underwater Respiration
- Able to turn his legs into a fish tail and back at will
- Fast Swimmer
- Underwater Pressure Resistance
- Can talk to fishes