Romeo

Romeo comes from another planet as a servant robot to his alien master, but his clumsiness caused his master to crash with another UFO and then enter a collision course with Earth. Since then, Romeo and his master were stranded in the South Pole for a millennium until he was ordered to find assistance to free the mothership. It became fortunate that Romeo found Kuro and his friends who helped foiled his master's invasion attempts over and over again. However simultaneously, Romeo would suffer being the wrong end of the stick by Kuro's wrath or karma itself for any trouble he may intentionally cause or not.

Despite being both a blessing and a curse for sticking around with Kuro and company, Romeo would eventually find his long lost love, Juliet. They would eventually marry during the after-half on both the manga and anime, and gained many children.

Although Romeo manages to settle down on Earth with Juliet by his side, he still dreams of returning to his home planet. But his attempts eventually fail due to bad stroke of luck or mainly Kuro's shenanigans.