She has red carmine hair with a black hat adorned with a pink feather. Her eyes are green. She wears a purple dress with light pink shades on her shoulders and skirt. Her stockings are lavender and matte black boots.
Between her and Dana, it appears that she the quiet one. She also seems to disapprove of witches attacking people they care about, which was demonstrated by her shock when Icy ordered Dana to attack her.
In "Broken Dreams," when the Trix were postulating some students, Icy speaks to Dana about her worthiness to join the school. When Dana states that her stong leadership skills and magical ability to transform anyone into monsters is proof of her worthiness, Icy orders her to prove it by using her spells on Jazmin.
Jazmin gasps in shock, appalled that Icy would order her friend to attack her. Dana refuses and this greatly displeases Icy, who states firmly that "witches don't do friendship!" She and Dana are then expelled out of the school through a crevasse.
Jazmin may know some basic, first-level spells that all witches can use, such as telekinesis, transmuting objects, and fixing minor messes. Like all witches, she can fly.