Fortuna was the guardian of Elior Forest and was Emilia's aunt on her father's side who took care of her instead of her mother.
SpoilerDuring her time in Eliot Forest, she developed a close bond with Geuse and they both looked after Emilia. After Pandora and Regulus attacked, she fought alongside Geuse to stop them. However, Pandora tricked Geuse into thinking Fortuna was her and Geuse accidentally killed Fortuna, causing him to go insane.