In this fanfiction, Shion and Kiyoki are likely two characters created by the fanfic author. They could be based on certain archetypes like Shion might be the more adventurous type, always looking for new experiences. Kiyoki, on the other hand, could be more reserved and calm. But when they meet, their personalities start to complement each other.
Mikey might be a character created to tell a story about Pop Rocks. He could be a fictional child used to illustrate the appeal or novelty of these candies. For example, he could be a curious and adventurous little boy who wasn't afraid to try new things, like Pop Rocks, which were quite different from other candies at the time.
In many fanfictions, Mikey is the optimist. He looks at the world with a positive outlook and tries to find the good in Rahzar. His friendly nature makes it easier for him to approach Rahzar, even though Rahzar might seem intimidating at first. Rahzar is usually depicted as having a lot of strength and power. He's a force to be reckoned with, but his character can also be complex, with hidden emotions that Mikey helps him uncover.
April and Casey might also be part of this fanfiction. April could use her reporting skills to try and figure out what's going on with Mikey's mutation, and Casey would be ready to fight any new threats that come along because of Mikey's changed state. Also, Splinter, as their sensei, would be guiding them all through this difficult time, providing wisdom and training to help Mikey control his new powers if he has any.
In the fanfiction, their relationship could develop gradually. Naruto, being the friendly and outgoing person he is, would approach Shion with an open heart. Shion, initially guarded, would be intrigued by Naruto. As they spend time together, Naruto would introduce Shion to his friends in Konoha. She would be welcomed into his world. Shion would in turn show Naruto the beauty and mystery of her own world. They would support each other through difficult times, like when Naruto faces political opposition in the village for being with Shion. Their love would grow stronger through these trials, and they would ultimately get married.
At first, it might be a bit rocky. Naruto is used to the fast - paced life in Konoha, while Shion has her own ways from her village. But as they share experiences, like cooking together or training each other, they start to appreciate each other more. Naruto would show Shion the fun side of life in Konoha, and Shion would introduce Naruto to the spiritual side of her village's shinobi culture. Over time, their love and respect for each other would grow stronger.
I don't have enough information to say who exactly 'Strongest Hero Shion' is. Since I'm not familiar with the specific novel, it could be a character created by the author with unique powers and a backstory.