The main characters in 'armor in the water fanfic' could be shaped by the overall theme and genre of the fanfic. If it's a historical - based fanfic, the main character could be a historical figure or a fictional character inspired by history, wearing armor appropriate for that era and facing challenges in water. For example, a Viking - like character in his traditional armor, trying to cross a large river or sail through rough seas. Or if it's a more modern - day superhero - inspired fanfic, the character in the armor could be a new superhero who discovers that his powers are enhanced or hindered when in contact with water, and there could be other characters like his sidekick or his nemesis also involved in the story.
Since we don't have much information about this fanfic, the main characters could be various. It might be a group of adventurers, where one of them is wearing the armor. Maybe there is a female character who is an expert in water - related magic or technology and she teams up with the armored male character. Another possibility is that the main character is a young person who discovers an ancient armor in a watery cave and then has to deal with the consequences of wearing it in the water - filled world around them.
Sasuke could also be a main character in such a fanfic. Maybe he is initially jealous of Naruto getting the chakra armor and there could be a rivalry between them as they both try to master the power it offers. And Sakura might also be involved, perhaps as the one who helps heal the wearer of the armor when they get injured during battles or training.
I'm not sure specifically what 'armor in the water fanfic' is about without reading it. It could potentially be a fan - created story where there is armor involved in a water - related setting, like perhaps a character in armor having an adventure in an underwater world or near a body of water.
In many 'female shining armor fanfic', there could be a mentor figure for the female knight. This could be an old, retired knight who imparts wisdom and skills to her. Additionally, there might be a love interest. This character could be a noble from the court or another adventurer. Their relationship with the female knight can be a central part of the story, adding an emotional aspect to the action - filled plot.
Since I haven't read the 'alone on the water fanfic', I can't say for sure who the main characters are. But it could be a lone sailor, an adventurer, or someone who has been stranded on the water.
Sometimes, characters like Spike, Twilight's assistant, could also be involved in the fanfic. He might be the one who first notices the budding relationship between Big Mac and Shining Armor and tries to either encourage it or cause some comical misunderstandings along the way.
Since we have no information about the 'a kink in the armor fanfiction' other than its title, the main characters could be anyone. It could be a group of friends where one of them has this 'kink in the armor' and the others gradually come to realize it. Or it could be a mentor - student relationship where the student discovers a flaw in the mentor that is the 'kink in the armor'. There are so many possibilities depending on the genre and the source material of the fanfiction.
If we assume that the 'Armor King Story' is set in a fighting - game - like universe similar to Tekken, then aside from Armor King, there could be other important characters. There might be his arch - enemy, who could be another powerful fighter with different motives. There could also be a mentor - like figure from his past who taught him the ways of combat. Additionally, there might be characters that he has to protect, such as innocent bystanders or a love interest that adds more depth to his story.
The main character is usually the water dragon slayer himself or herself. They often have unique powers related to water manipulation, like creating water whips or tidal waves. Another common character is the mentor, who could be an older dragon slayer or a wise mage who teaches the protagonist the ways of slaying water dragons.
It could be a young hero. In many such novels, there is a protagonist who is initially inexperienced but gradually becomes stronger with the help of the star armor. There might also be a mentor figure who guides the main character in understanding the power and significance of the star armor.
I'm not certain. But usually in such novels, there would be a protagonist who is likely to be closely associated with the events related to the water. Maybe a detective or someone with a personal connection to the water - related mystery.