A skilled fighter and respected member of Eden, Heidi has known Keia since they were teenagers and was the one who recruited them. Heidi has been with Eden since she was a young child and has developed a wide skillset not overlooked by her higher-ups. She is approachable but stoic, goal-oriented but not reckless, and is able to easily recognize peoples’ weaknesses and desires in order to extract information from them. Her higher-ups lean on her for many of the most important tasks, and she always delivers without fail.

Heidi is Keia’s very first friend, despite having met when they were eighteen and sixteen respectively. Rubinae are rare in today’s day and age, and so to meet another of the same species, even if Keia was only a half-blood, immediately gave them a special place in Heidi’s heart. Despite everything, years later, that special place has refused to budge, but feelings between the two are complicated and Heidi can’t risk them getting in the way of the job she has to do. Eden gave her a home when she had nothing left, and so she must put it above all else.

Heidi is a strong and levelheaded person. She likes to spend what little time she gets to herself in nature. While working, she takes on as many tasks as she can so that she doesn't have to address certain feelings of emptiness within her.