She is described as being rather high-tech, with a humble and mature personality and a level head, 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 Switzerland 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.
Although few of her relationships have been shown in canon, her profile in Volume 4 states that she is social and has many friends.