Based off a prompt on Tumblr: "I want a superhero series where they have powers that 100% contradict their personalities".
Molly grew up as a fisherman's daughter in a village by the ocean, so naturally, it was a surprise to her and those around her when she acquired fire powers. Everyone around her had some sort of magic, but they all were compatible with who they were. Molly's mother had died in a fire for Aglea's sake! (Note: Aglea is a goddess who's name just happens to resemble a Greek goddess. They're very different.)
Jax was the son of a rich blacksmith, who shocked everyone by developing water powers, and strong ones at that. When the two meet, they go on a journey to save Molly's village from a witch who wants their magic for her own. If they can't stop her, her icy grip will smother the world. Will something other than friendship develop over this trip? Only time will tell.
(I don't own the cover image if you know who it belongs to, tell me so I can credit them. Also, you have no idea how tempting it was to put Fire Boy and Water Girl as the cover. I mean, reversed genders, but still.)
Some of the magic bits are heavily based off of ATLA.