Pia is a young dwarf girl and one of the main characters in the anime Dragon Half. She lives in the same village as the protagonist Mink and belongs to Mink's close circle of friends, which also includes their companion Lufa and a small mouse-like creature named Mappy. In appearance, Pia is a teenage girl with brown eyes and short black hair that reaches neck length, though she is almost never seen without her suit of body armor.

Her constant wearing of armor is a defining feature of her backstory. Her parents are extremely protective of her, and it is because of their overprotectiveness that she always dresses in body armor. The armor is treated as a significant part of her character; in related Dragon Half media, she is associated with an invincible armor that can deflect attacks directed at her allies.

In terms of personality, Pia is cheerful, lively, and easily carried away by excitement. She shares Mink's and Lufa's strong enthusiasm for the superhero and pop idol Dick Saucer, and she becomes especially delighted whenever she gets her hands on one of his newest CDs. She has a warm and loyal nature, which makes her a dependable companion within the group.

In the story, Pia acts as a supportive friend who accompanies Mink on her adventures, helping the group through the comedic and dangerous situations they encounter along the way. Her key relationships are with Mink, Lufa, and Mappy, with whom she shares friendship and common interests, and with her protective parents, whose concern for her safety explains why she is always armored. Her motivations are centered on loyalty to her friends and her shared passion for Dick Saucer. Throughout the series she remains a consistent and devoted presence, keeping her enthusiastic personality and her characteristic armor as she stands by her friends.