Hi!
Thanks so much for asking this question.
To be truthful…I don’t know either…T-T
So, I’ll make this simple to not waste your time.
Y/N: can use any type of magic (based on her spirits), can now use celestial powers after consuming the Heart of Magix (with also her Magix form).
Igneel: Fire, (probably lava/magma too, but I haven’t gotten that far)
Shadow: Dark/Shadow Magic (think of Raven like in the Teen Titans)
Sky: Sky Magic (based on Wendy from Fairy Tail), can heal, and use air/ wind magic
Celestia: Light Magic (basically nothing that sheds light on things), she can also control the sun to a certain degree.
Goku: Earth Magic, think of him as an Earth bender From Avatar
Aqua: (like his name) water magic, can also freeze it and turn it into snow as well
Icy: Ice Magic, can control ice and water (to a certain degree)
Flora: Nature Magic, like Sky, she can heal and enhance, but hers is based off of nature, the animals and the living earth.