Other characters that resemble Aerith.
Rinoa Heartilly
Aerith and Rinoa don't really look like eachother, but they are very similiar in personality. They both have that childish/bubbly nature, with a sort of innocent, angelic demeanor.
Garnet til Alexandros
Another clone of Aerith's that don't look alike, but have similar characteristics. Both Aerith and Garnet are magic users, and are apart of an endangered race. Garnet's mother died when she was just a young girl, like Aerith. Both were brought up by a different woman. I don't think Garnet acts like Aerith in any way. Garnet is much more reserved, like Tifa.
Eiko Carol
Although much younger compared to Aerith; both her and Eiko are also magic users, and are apart of an endangered race, the same race as Garnet. Both are open and honest about their feelings and speak their mind.
Yuna
Yuna is quite different from Aerith's personality, she is somewhat reserved, but also can be very bubbly. Yuna is a magic user as well.
Mimi Tachikawa
I swear, Mimi is the anime version of Aerith. No, really! The hair... the dress! Mimi is a bit more girlier and gets quite angry most of the time. But both are usually blunt about their feelings. Oh yes... and the whole Yamato/Mimi thing being compared to Cloud/Aerith, yes they definitely look alike! But Yamato and Mimi as a couple? Well, uh... Not so sure about that one, buddy.