Well, Natsu is known for being impulsive and enthusiastic. So his singing would be similar in that it would be very spontaneous. He might not follow all the rules of music but rather sing in a way that comes straight from his heart. His singing could have a bit of a rough edge to it, just like his personality which isn't refined but is full of charm.
Natsu is a very positive and determined character. His singing would likely carry those traits as well. He would sing with a sense of hope and strength. His singing style might be like a roaring fire, much like his Dragon Slayer magic. It would be powerful and able to capture the attention of those around him, just as his strong personality does.
Natsu is very impulsive. This might make him overprotective of his daughter in the fanfiction. He might jump into action at the slightest sign of danger to her. For example, if she's in a simple sparring match in the guild, he might be tempted to interfere if he thinks she's in real danger.
He might become more brooding and distrustful. Banishment is a harsh experience, and Natsu, who was always so close to his Fairy Tail family, would feel betrayed. This could lead to him suppressing his emotions and becoming more solitary as he tries to figure out how to clear his name.
In fanfictions, Natsu's anger often has a significant impact on his relationships. His anger towards enemies unites him more closely with his Fairy Tail comrades. They see his passion and are inspired to fight alongside him. However, his anger can also create misunderstandings. For example, if he gets angry at a new member of the guild who made a mistake but was actually trying to help, it could make that person feel unwelcome at first. Overall, his anger is a double - edged sword in his relationships.
His relationship with Lucy would be greatly affected. She might be one of the first to try and clear his name or convince the guild to take him back. Their friendship would face a huge test as she has to balance her loyalty to the guild and her belief in Natsu.
His relationship with Lucy would be interesting. If reborn, Natsu might be more protective of Lucy from the start. He could also share his past life memories with her, which would deepen their bond even more. They might start going on adventures together even earlier in the story.
With Lucy, it could bring them closer in a way. Lucy might feel sorry for Natsu and try to help him get back into the academy. This shared goal could strengthen their bond as friends. She could also offer her place for Natsu to stay while he figures things out.
In his human form, Acnologia might be more complex. As a dragon, he's mainly seen as a destructive force. But as a human, he could have emotions like regret, love, or compassion. For example, he might feel remorse for the destruction he caused as a dragon.
One popular theme could be Natsu singing to cheer up his friends in the guild. For example, after a tough battle, his song might lift their spirits and bring back the lively atmosphere in Fairy Tail. Another theme could be Natsu singing a song that has a connection to his past, like a song from his childhood that he remembers faintly. It could be a lullaby his mother used to sing to him, which would add an emotional depth to the fanfiction.
Well, for Lucy, she would feel like she lost a part of herself. Natsu was always there for her, and his death would leave a huge void. Gray, who has been Natsu's rival and friend, would have his world shaken. He might even question his own strength and purpose. Erza would be in deep pain, but she would also try to hold the guild together. The younger members of Fairy Tail would look at Natsu's death as a great loss and it could change their view of the guild's missions. They would become more cautious or more determined depending on their personalities. Overall, the guild's dynamic would be severely disrupted.
Tsuna in Fairy Tail fanfiction? He would be a great addition. His character is all about growth and adaptation, which is a big part of the Fairy Tail spirit. He could start as an outsider, just like how some characters join the guild later. His unique powers would surely attract attention. The Fairy Tail guild is known for accepting different types of magic and people. Tsuna's kind heart and his determination to protect his friends would resonate with the guild members. And his journey to become stronger could be intertwined with the various storylines and adventures already present in the Fairy Tail world.