Liechtenstein has blonde hair, in a chin-length bob cut like her 'brother' Switzerland. As shown in flashbacks, she used to wear her hair long and in braids, but she cut her hair to look more like Switzerland and found that it was more comfortable.
She is described as being rather high-tech, with a humble and mature personality, though she will clearly state her views. She was passed along many different nations throughout her life, which became rough and difficult for her after WWI due to a food shortage. However, Liechtenstein was saved from her situation when Vash found her and adopted her as his sister.
Due to her resemblance to her brother after her haircut (and having worn a duplicate uniform), Liechtenstein was once mistaken for being a young boy. Switzerland rectified this problem by gifting her the purchase of a ribbon of her choice.
Before her adoption, she was shown to wear a pink dress and apron, which had become damaged due to the aftermath of WWI and her having fallen into poverty.