She's not from around here. Hispanic, and perhaps something more - she speaks flawless Spanish, but with an accent that isn't quite Mexican. She's usually seen on foot, or riding an ancient, scuffed bicycle.
Bicycling - Maybe she does it because she has to, or perhaps because she enjoys the exercise.
Nature - Ixchel enjoys the outdoors, and the rhythms of nature.
Mythology - She is surprisingly familiar with the supernatural, especially the traditions of Central America.