Good, gonna make a character then, and then smuggling it onto the ship and cause some havoc. In hilarious proportions i might add.
edit: Here we go!
Species: Rolmber. A subterranean quadruped species that lived in caves for eons before they got intelligent enough and invented technology. They have two eyes that serve as heat sensors and several chitinous growths along their spine to detect vibrations in the atmosphere. In effect, they see heat, and listen with their spine. The species communicate with chirping noises and gesturing with their front right appendage which has long since evolved into a very dextrous manipulator with 4 digits that end in sharp claws. Their other limbs have membranes between the digits but no claws, acts like suction cups for climbing or even sticking to ceilings but they have long since abandoned their caverns. They are carnivorous and aggressive in nature, but evolution made them intelligent enough to create and handle very complicated technology. They are still somewhat pugnacious compared to other lifeforms, but they are not the blood thirsty cavern predators they once were. They are hairless and have a grey stone-textured skin tone. The average Rolmber is about 1.3 meters tall and weigh about 35 kg.
Alien individual: Due to the Rolmber language consisting of mostly different pitches and tones of chirping, this particular Rolmber opted to name himself "Fizz" in the common galactic language around these parts. He is 20 human years old, and is a child compared to his race's average lifespan of 130 human years. He is a very curious Rolmber and left his home planet on an "adventure" that had him sneaking onto a trader's cargo hull after obtaining the necessary translator collar, a pair of light sensor goggles (he cant see anything that has heat equivalent to atmospheric temperature, so the goggles removes the impairment by making the object visible to him) and a bag of his tools. He is somewhat of a troublemaker in the sense that he, even from the eyes of a common technologically savvy Rombler, likes to tinker with anything and everything electronic or is otherwise made of mechanical parts, and usually causes accidents by over modifying everyday tools into weapons.