>Why not let those who claim Nia is a mary sue to explain why?
Sure. Nia suddenly appeared on the scene the episode after Kamina died, knowing nothing about anything. She immediately dazzled everyone on the crew and generally stuck out like a sore thumb, kinda like if Snow White joined the FARC. Later, she got possessed by the Anti-Spirals and became a human McGuffin and an excuse for Simon to travel halfway across the galaxy to search for her. Then, when she finally married Simon, she 404'd. In short, she's a walking plot device, and so beautiful and perfect and wonderful and blah blah blah. Now if they could show what she did in the 7 years between eps 15 and 17 she might be redeemed.