Ylgr

"Family? You have a little sister, don't you? You do, don't you? That's why you didn't kill me. I knew you were a good guy...even if you look like a bad guy."

- Ylgr talking to Helbindi

Ylgr is a Book II character from Fire Emblem Heroes. She is the youngest princess of the Ice Kingdom Nifl and the younger sister of Princesses Gunnthrá and Fjorm as well as Prince Hrid.

Profile
With Nifl ravaged by war, Ylgr was captured and held prisoner by Helbindi. She is initially worried about her siblings, but after listening to him talk about his life in Múspell she surmises that he must be a good person despite appearances, and that he has a younger sister. After being rescued by Alfonse and the Order of Heroes she insists on joining the group.

Etymology
In Norse Mythology, Ylgr is the name of one of the eleven rivers of Élivágar, the ice rivers that flow in the Ginnungagap.

Ylgr is also an Old Norse word meaning "she-wolf".