Yes, there are likely fanfictions out there with the concept of 'Naruto is Sub Zero'. You can start by checking popular fanfiction websites like FanFiction.net or Archive of Our Own. They have a vast collection of fan - created works and you might find some interesting crossovers with this premise.
Another key element is his place in the Mortal Kombat universe. His origin story sets up his relationships with other characters, like his rivalry with Scorpion, which is a major part of the overall Mortal Kombat story.
Sub - Zero is a well - known character in the Mortal Kombat series. His origin story involves him being part of the Lin Kuei clan. He has ice - based powers which he uses in combat. He was initially trained as an assassin in the clan.
Well, a major theme is the power dynamic. Sub - Zero has his ice - based powers and Kitana has her own set of combat and leadership skills. How they balance this power in their relationship is often explored. Cultural differences also play a big role. The cold and austere culture of Sub - Zero's realm versus the more refined and magical culture of Kitana's Edenia. And of course, there's the theme of loyalty. They both have loyalties to their own people and how they navigate that while being involved with each other is a common thread in many fanfictions.
One possible plot could be Naruto being transported to the Mortal Kombat universe and somehow taking on the role of Sub Zero. He might have to fight in the Mortal Kombat tournaments using his ninja skills along with Sub Zero's ice powers.
One popular Sub - Zero and Kitana fanfiction is 'Frozen Love in Edenia'. It explores a unique relationship between them where they have to overcome the differences between their realms. Another great one is 'Sub - Zero's Quest for Kitana', which details Sub - Zero's journey to protect Kitana from various threats. And 'Kitana and Sub - Zero: An Unlikely Alliance' is also quite interesting as it delves into how they form an alliance despite their initial animosity.
One interesting concept could be the exploration of a frozen or sub - zero version of the wizarding world. Maybe there are new spells or potions related to ice and cold. For example, a freezing charm that is much more powerful than the normal ones in the original series.
Another plot could be that the OC is an apprentice of an enemy clan. Sub Zero is sent to spy on the clan and meets the OC. The OC is different from the others in the clan, being more kind - hearted. Sub Zero sees this and decides to protect the OC from his own clan's wrath, leading to a complex relationship.