Aerith is upbeat and joyful, and several times in Final Fantasy VII attempts to cheer up her fellow party members. As she was raised in the Midgar Slums, Aerith maintains that she can take care of herself, and is capable of fighting off Shinra troops, as well as demonstrating more subtle forms of savvy. When Aerith has made up her mind about something, she will not listen to anyone who tells her otherwise. Aerith and Tifa can often be found spending time together when the party splits up and are good friends.

As a child, Aerith was reluctant to accept her Cetra heritage, and in Final Fantasy VII she admits to Cloud she considers herself alone, as she is the only remaining Cetra. She exhibits strange personality quirks at times, such as being afraid of the sky in Crisis Core -Final Fantasy VII-, and claiming she can "hear the wind calling her" in Before Crisis -Final Fantasy VII-. These traits may be influenced by her Cetra heritage allowing her to communicate with the Planet.

Holy Odyssey