Lahwhinie (various spellings exists) is a mouse who lives somewhere in Hawaii. She has a strong physical resemblance to Gadget Hackwrench.
She is manipulative, beautiful and ambitious; quite willing to put some innocent rodents in deadly danger rather than lose her coveted chance at being Queen of the tribe she lives with.
Lahwhinie appeared in only one episode, Gadget Goes Hawaiian.
She is adored by her Hawaiian tribe of mice, due to her ability to cease the imminent eruption of a nearby man-made model volcano. In reality, she had simply discovered the mechanism (depicted as a valve of some sort) which disables the volcano, and built her hut around it. She has used this to gain power over the tribe.
The next step in her path to complete power over "her" tribe is to become Queen. In order to do this, she must first undergo a series of tests.
After a chance meeting, Lahwhinie convinces Gadget to face her trials in her place. So as not to alert the rest of the Rescue Rangers, she pretends to be Gadget.
Lahwhinie makes appearances in many fan-fictions. A topic is often, why she looks so identical to Gadget; many authors solves this by declare Lawhinie to be a (half-)sister of Gadget – but there are other solutions too. The spelling of her name also differs, because there is no canon spelling available.