Walkatrout is a blue, bipedal, fish-like alien. His body shape is mostly round with tiny arms and legs. He has a large dorsal fin on the tip of his head and a tail fin on the end. He wears a black jumpsuit and green boots with fins on the back of them.
The Omnitrix symbol is located on the left side of his tail fin.
- Enhanced Swimming- Walkatrout has enhanced swimming and can swim fast underwater.
- Slippery Body- Walkatrout has a slippery body, preventing any opponent from grabbing him.
- Underwater Breathing- Walkatrout can breathe underwater.
- Poor Combat- Walkatrout has about no way to attack his opponents. He is also short and tiny making him basically powerless over his foes.
- Size- Due to his diminutive size, Walkatrout has a tougher time going against much larger opponents.
- Upon age, as a result of evolutionary mimicry, Walkatrout's dorsal fin gets bigger resembling that of a shark to help deceive others to make it look like a predator while underwater.