Ann is a very kind and compassionate girl, enough for it to be noted by both Morgana and Sojiro Sakura. Years of isolation due to her looks have left her very withdrawn, with the belief that she's lost her place in the world. This hasn't stopped her from opening up to the people close to her and making jokes. She's able to press on without caring about the opinion of others due to her friendship with Shiho Suzui, who was her first real friend in Japan before joining the Phantom Thieves. She is shown to be a good judge of character, as she was the first person able to look past the rumors of the protagonist and see him for who he really is (while Ryuji Sakamoto befriended him before her, it was because he saw him as just another "troublemaker" and didn't learn his full story until later). Her good judgement of others is also shown by her willingness to forgive Makoto after learning her side of the story in the incident with Suguru Kamoshida, namely that she wanted to do something but felt powerless to stop him, having realized it wasn't too different from her own situation. Before this, she also comforts Makoto when she calls herself "scum of the Earth" due to her failure to help Kamoshida's victims, saying that if she really was scum, she wouldn't call herself such.

As a Phantom Thief, Ann becomes far more lively and energetic, with a strong will to never be abused or let abuses run unchecked. She agrees with Ryuji's desire to help those in need is because she believes that if she doesn't, she'll go back to being the same as she was before (ie. someone who could only look on while other people suffered instead of stepping in.)