We're quite happy to accommodate what works best for you! URSULA can give him a robotic body if you wish or he could be a modified waterproof soccer ball with something like propellers (or your preferred water and air/land movement device!) to get around.

Since he's robotic by nature, he'll be able to use some of the salvage he finds to customize himself with URSULA's help as well! So you can essential upgrade him over the course of the game how you like.