Cecilia has a caring and selfless personality, willing to risk her life to save survivors from a Honkai outbreak and sacrificing herself to save those dear to her. She is also sweet and innocent, trying to see the good in people and never giving up hope when it comes to fighting for the better, and cautious whenever she gets into a fight.

In the past, Cecilia used to have a sad personality despite fighting the Honkai, until she met Siegfried Kaslana and started becoming more cheerful with him.