She has a fantastic story that is concisely told. Her mother was the Princess of Caelin, her father a nomad from the plains hired to be her bodyguard. They fell in love and eloped to the plains where Lyn was born and raised among her father's tribe. Her mother's father, the Marquis of Caelin, was enraged by this and never reached out to them again.
When Lyn was still young her tribe and her parents were massacred, leaving her the last of her kind. Meanwhile, her grandfather the Marquis fell ill and regretted his long estrangement from a granddaughter he had never met. He sent men to find Lyn and bring her to Caelin so he could see her before he died. But then, taking advantage of the Marquis' weakened state, his scheming brother plotted to seize the throne by having Lyn assassinated on her way there.
Her campaign is about fighting her way back through her mother's homeland, not because she wants to rule Caelin, but so that she can meet the only family she has left in the world.
Also she has incredible crit animations.
She's noble by blood but doesn't know how to be anything other than a nomad. She's not shackled by duty, but she follows her heart and lets nothing stand in her way. It's impossible not to root for her. Lyn and Ike are definitely the most unique and likable Lords in the franchise; it's no coincidence that they were the poll winners.
Hmmm you know what yeah that does look better.