Fjorm

''“One of the princesses of the Ice Kingdom Nifl. She met Alfonse when fleeing her country after it was conquered. She’s kind-hearted, loves her family, and believes in honoring debts—but she also despises those who ruined her home.”''

-Adventurer Details

Fjorm is originally a character in Fire Emblem Heroes, and was made temporarily available via summoning during the Fire Emblem Lost Heroes event, along with Alfonse, Marth, and Veronica.