Well, Natsu is full of energy and has great combat abilities with his dragon - slayer magic. Erza is strong - willed and has a vast collection of armors for different situations. Mira is charming and has unique transformation magic. In fanfictions, these traits combine to create exciting storylines. For example, Natsu can start a fight, Erza can lead the strategic part, and Mira can provide support or a surprise element in battles.
The trio of Natsu, Erza and Mira is great in fanfictions because they represent different aspects of a successful team. Natsu is the power - house, always ready to take on challenges head - on. His fiery personality adds a lot of action to the stories. Erza is the skilled and experienced leader type. She has a strong sense of justice and her combat skills are second to none. Mira is the more adaptable and versatile member. She can change her form to suit different needs in the story. In many fanfictions, their combination of these qualities allows them to overcome seemingly impossible obstacles. For example, in a story where they need to rescue their friends from a magical prison, Natsu uses his brute strength to break through some barriers, Erza uses her strategic mind to figure out the prison's layout and weaknesses, and Mira uses her transformation magic to get past security systems.
In fanfictions, Natsu, Erza and Mira make a great trio because of their distinct personalities. Natsu's impulsiveness often gets the story moving forward as he jumps into action without much thought. Erza, on the other hand, is the voice of reason and discipline. Mira is the one who can bring a sense of calm and also has a mysterious side to her magic. Their interactions are full of potential. They can have arguments due to Natsu's rashness and Erza's strictness, but also moments of great teamwork. For instance, in a fanfiction where they are facing a powerful wizard, Natsu charges in first, Erza quickly assesses the situation and formulates a plan, and Mira uses her magic to assist them both, either by healing or by enhancing their powers.