The engineer for the Octopod, it's Tweak's job to make sure everything is running smoothly below deck in the engine room and to maintain all the Octonaut vehicles. She's dedicated to work on special devices to help the Octonauts in their missions, and has even invented a number of new machines for the Octonauts, most notably the Gup submersibles.

She likes to build and fix things, and the many machines and devices Tweak invents sometimes work out in unexpected ways. She's also very fond of eating carrots