She wears a green swimsuit, green bracelets, flats, and a green choker.
Heidi is an athletic person. And is shown to enjoy hearing Musa's music.
Heidi attends Alfea. She participates in Miss Magix contest, where she shows her gymnastic skills.
In "The Shadow Phoenix," she is seen walking around Alfea. She listens to Musa's sound check. She is later seen listening to Ms. Faragonda's speech, where Stella gives her Bloom's hairband.
Heidi makes her debut alongside Lavigne in Issue 12 fighting to protect Alfea from the Trix's Army of Darkness. After shooting down one of the aerial soldiers, Lavigne praises Heidi on making such a nice shot, calling her Lavigna in the process.
Heidi makes another appearance in Issue 39 attending Destiny Boy's Magix City concert. This time, she is in an incorrect color palette as, instead of retaining her red hair, grey eyes and khaki-colored outfit, Heidi's hair, eyes and lips are bright blue while her outfit is completely red.
Heidi may know some basic, first-level spells that all fairies can use, such as telekinesis, transmuting objects, and fixing minor messes.