He has shoulder-length brown hair and green eyes. Lithuania sometimes wears his hair tied back into a ponytail, such as when he worked as a housekeeper or when he was younger. In the strip 'While You Were Gone', Lithuania is shown to have deep scars covering his back.
The eldest of the three Baltics, Lithuania controlled Middle and Eastern Europe during the Middle Ages, and was actually a formidable nation that used to beat Prussia, until he was taken by Russia. Though he managed to get away for a time, he always wound up back under his control. After the Soviet Union fell, he fully regained his independence and went to rehabilitate with Poland.
He is a bit of a serious introvert, winds up being easy to take advantage of, and is the type who will welcome one into his heart once he knows the person. He also tends to depress himself so much that he gets a stomachache. Lithuania is also said to be into martial arts and literature, and he drives a second-hand car.
In a rare strip, it is shown that the other two Baltics think highly of him, but resent that he ignores them in favor of spending time with Poland.