Shining Armor, her husband, would surely be a main character. He could be shown as a very supportive and protective partner. He might be by her side during doctor visits, making sure she is comfortable and taking care of all her needs.
It could be that this fanfic is a rather dark exploration of the My Little Pony world. It might show the breakdown of relationships after Princess Cadence's death. For example, friendships between ponies could be strained as they deal with their grief in different ways. It could also touch on themes of hope and recovery, like how the ponies try to move forward and restore the kingdom to its former glory without her.
One possible storyline could be Princess Cadence preparing for the arrival of her baby. She might be seen redecorating the nursery, choosing baby names, and sharing her pregnancy experiences with her friends and family. For example, she could have heart - to - heart talks with Twilight Sparkle about the joys and fears of motherhood.
At first, they could be a bit wary of each other. Princess Cadence, coming from a more refined and magical background, might find Naruto's brash ninja ways a bit strange. But as they face challenges together, like fighting off common enemies or solving problems in their joined quests, they begin to understand and care for each other more. This could lead to a romantic relationship, with Naruto's determination and Princess Cadence's kindness complementing each other.
Friendship is a very common theme. Their strong bond as friends often drives the plot. For example, in many fanfictions, they support each other through tough times.
One possible plotline could be that Naruto is somehow transported to the world where Princess Cadence is from. Maybe he has to help her protect her kingdom from an unknown threat. He could use his ninja skills like shadow clones to confuse the enemies.
Well, surely Princess Cadence herself is a main character, even though she might die in the story. Her husband Shining Armor would likely be a main character as well, as he has a very close relationship with her. Twilight Sparkle, being Cadence's sister - in - law, would also probably be a major part of the story, since she would be deeply affected by Cadence's death.
Perhaps Naruto is on a quest in an unknown land and stumbles upon Princess Cadence in distress. He helps her out, and she, in return, offers to help him on his journey. Along the way, they meet various characters from both universes. They learn from each other's values, like Naruto's never - give - up attitude inspiring Princess Cadence's people, and her grace and diplomatic skills helping Naruto in his interactions with different tribes in her land.
Yes, there are many. Some might focus on their adventures together, like protecting the kingdom from a new threat. These fanfics can show their strong bond as a couple and their responsibilities as royalty.