Tweak

Tweak is a main character in Octonauts. She is the engineer for the Octopod. It's her job to make sure that everything is shipshape below deck in the engine room and maintains all of the Octonaut vehicles. She has even invented a number of new machines for the Octonauts, along with a whole new GUP that was revealed in the Christmas Special, the Gup-X .She also invented the Gup-S in Over Under Adventure. She as well invented the Gup-H which was seen in the 'The Poison Dart Frogs' episode and the 'The Baby Sea Turtles.' She invented the Gup i which was seen in 'The Emperor Penguins' and The Operation Deep Freeze. She is working on new gups like the Gup-O, Gup-R, Gup-G, Gup K, Gup M and Gup Y. She also likes fixing and inventing things that sometimes work out in unexpected ways. She is one of the only two females on the Octonauts crew.(resembling the younger one)

Appearance
Green, with a tuft of fur and a pink bandanna on her head, white muzzle, a little white bunny tail, a tool belt on her waist, and a pair of blue boots each with an Octonaut logo.