There could be a 'anna has powers fanfic' where her powers are related to nature. For example, she can communicate with animals and make plants grow rapidly. This leads to her having to protect the natural balance when some dark force tries to disrupt it. She teams up with other characters who also care about nature and they fight together.
Anna's fire powers could be described as a searing blaze that she can summon at will. The flames might be a bright orange - red, with a heat so intense that it can melt ice in an instant. When she gets angry, the flames could flare up uncontrollably, reaching higher and burning hotter. She might be able to shape the fire into different forms, like a whip to lash out at enemies or a shield to protect herself. The fire could also have a unique quality, such as leaving behind a trail of warm embers that slowly fade away.
You can try fanfiction websites like Archive of Our Own. There are often a large number of fan - created stories, including those about Anna having powers. Just use the search function and type in 'anna has powers' to find relevant fics.
One plot idea could be that Anna discovers her fire powers in a time of great danger for her village. She has to quickly learn to control them to fight off an invading force of ice creatures. Another could be a story where Anna is ostracized because of her powers at first, but then she uses them to save a friend who didn't believe in her, thus winning back the trust and friendship of those around her. A third idea is that Anna is transported to a different realm where her fire powers are seen as a gift from the gods, and she has to use them to help the people of that realm defeat an evil sorcerer who has been oppressing them.
One great 'anna has powers' frozen fanfic could be about her using her new - found powers to save Arendelle from a mysterious and powerful threat. In this fanfic, she might have to learn to control her powers quickly and make tough decisions along the way.
A 'anna fire powers fanfic' could be really exciting. It might explore Anna from a particular story or franchise having the power of fire. The fanfic could involve her learning to control this new power, perhaps facing challenges where she has to use it to save her friends or her world. There could be intense battle scenes where she unleashes her fire powers in creative ways.
One possible fanfic could be about Anna discovering her fire powers in a hidden part of Arendelle. Maybe she stumbles upon an ancient relic that unlocks this power within her. And then she has to learn to control it to protect her kingdom from new threats.
Another option is to check out Tumblr. There are often posts about fanfics, and some users might recommend 'anna has powers' frozen fanfics. You can also search relevant tags on Tumblr to see if there are any fanfic excerpts or links to full fanfics.
One possible plot could be that Anna discovers her fire powers during a dangerous situation, like when she's trapped in a burning building and suddenly realizes she can control the fire. Then she has to figure out where these powers came from.