I'm not sure which anime you're referring to because it's not very common for an anime to have both water and ice powers. However, if you can provide more information or context, I can try to provide you with a more accurate answer.
He could start by simple things like creating ice cubes at will. Then progress to making small ice sculptures, which could later grow into larger and more complex ones. Eventually, he could learn to create ice storms or even entire ice landscapes.
One interesting Naruto ice powers fanfiction could involve Sasuke somehow obtaining ice powers. Maybe through a forbidden jutsu experiment gone wrong, he now has the ability to create ice sculptures that can also be used as weapons. For example, he could make ice shurikens that are much more powerful than the normal ones and have a freezing effect on the opponent.
A Danny Phantom ice powers fanfiction could explore how his friends react to his new power. Sam and Tucker might be both amazed and a bit worried. They could help Danny test his powers in a safe environment, like an abandoned warehouse. And Danny might use his ice powers to create cool (pun intended) sculptures for fun, but also discovers that the power has a deeper connection to his family's ghostly heritage.
There could be a fanfiction where a character with ice powers is actually an enemy in the Percy Jackson world. They are trying to freeze over all the water sources, which would be a huge threat to the demigods. Percy and his friends have to figure out how to stop this ice - powered foe. They might discover that the only way is to find a way to combine fire and water powers in a unique way, like using the heat from Hephaestus - forged weapons along with Percy's water control to melt the ice and defeat the enemy.
In Miraculous Ladybug fanfiction, ice powers can add a whole new dimension. They might be given to a new character, perhaps a villain. For example, a character with ice powers could freeze Paris, creating a unique and challenging situation for Ladybug and Chat Noir to overcome. It could also be a power that a Miraculous holder temporarily gains, leading to interesting plot twists.
They can be portrayed as a destructive force. For instance, an Akuma - controlled character with ice powers could be freezing everything in sight, causing chaos in Paris. This makes it a huge threat for Ladybug and Chat Noir to handle.
Well, a 'Frozen OC with Ice Powers Fanfiction' can offer a fresh take on the Frozen story. It can introduce new magical elements related to ice powers. For instance, the OC might be able to transform into ice itself, which is something we haven't seen in the original Frozen movies.
One possibility could be that Draco uses his ice powers to protect his friends. In the fanfiction world, he might be in a situation where his friends are in danger from some sort of fire - based threat. His ice powers would come in handy to extinguish the flames and keep everyone safe.
I can recommend you a Xianxia cultivation novel called Mortal: The Daily Life of the Masked Moon Sect. The male lead was a mortal with a rare ice-type mutant spiritual root. He yearned for the daily life of the Masked Moon Sect, but in the Dharma Ending Tribulation, he had to shoulder the mission of saving the world. This novel has both the world setting of Xianxia and the ice element of the superpower. If you like ice superpower users, why don't you take a look at this book? I hope you like my recommendation. Muah ~