Gildarts would probably win. He's one of the strongest mages in Fairy Tail. His magic is very versatile and his strength is off the charts. Natsu is strong, no doubt, but he's still young and has a lot to learn. In fanfiction, the writers might be tempted to make it a close fight, but realistically, Gildarts' skills and power level are much higher. He's faced much tougher opponents and come out on top.
It depends on the situation. If Mr Bison could quickly use his Psycho Power to control Natsu's mind, he might win. But if Natsu gets close enough to use his fire - dragon - slayer magic, he could deal a lot of damage to Mr Bison.
It's really hard to say. Goku from Dragon Ball Z is extremely powerful, with his Super Saiyan forms and ability to destroy planets. But characters in Fairy Tail like Acnologia are also very strong. Acnologia is a dragon slayer who can transform into a dragon himself. However, if we consider Goku's continuous growth in power and his combat experience against powerful foes across the universe, he might have the edge in a fight.
Goku might have the upper hand. His power levels are off the charts and he has experience fighting all kinds of powerful foes across the universe. But Irene is not to be underestimated. She has her own set of skills and strategies. In a fanfiction, if the writer decides to give Irene some new powers or abilities, she could potentially give Goku a tough fight. But generally, Goku's raw power and combat experience make him a strong contender.
In a fight between Natsu and Mavis in a fanfiction, it's really hard to say who would win. Natsu is extremely powerful with his dragon slayer magic, being able to take on some really tough foes. However, Mavis is the first master of Fairy Tail and has a great deal of wisdom and powerful magic herself. It could really go either way depending on how the fanfiction writer wants to portray the battle.
In my opinion, Natsu would have a good chance of winning. Natsu is known for his incredible determination and his ability to keep getting back up no matter how tough the fight. His Dragon Slayer magic gives him great power and his Fire Dragon's Roar can deal significant damage. Also, his experience in various battles has toughened him up. However, Laxus is no pushover either. He has his Lightning Dragon Slayer magic which is extremely powerful. But Natsu's never - say - die attitude might just tip the scales in his favor.
In the fanfiction, Gildarts could meet Natsu and Igneel during a time of crisis. Maybe their town is under attack. Gildarts would immediately jump into action, and Natsu would follow suit, with Igneel guiding Natsu from the side. Gildarts might be impressed by the way Natsu and Igneel work together, as if they share a single mind. They could communicate without words, and Gildarts would try to learn from their unique bond. After the battle, Gildarts would offer to train Natsu further, seeing his great potential enhanced by his connection with Igneel.
Obviously, Natsu would be one of the main characters since the fanfiction is centered around him fighting. His friends from Fairy Tail like Lucy, Gray, and Erza are also very likely to be main characters. They would be the ones watching Natsu fight and having reactions to his actions in the battle.
Finding good gay fanfiction about Gildarts from Fairy Tail can be a fun but challenging task. Fanfiction communities are vast, and there are many different interpretations of characters. To find the ones that suit your taste, you can join Fairy Tail - related forums or groups and ask for recommendations. This way, other fans can point you towards the more interesting and well - written gay fanfictions featuring Gildarts.
Goku from Dragon Ball Z could be a great crossover character for Natsu. They are both very strong and have a love for fighting. Goku's ki - based attacks and Natsu's fire magic would make for some epic battles. They could also train together and learn from each other's fighting styles. Also, Alucard from Hellsing could be an interesting crossover. His vampiric powers against Natsu's magic would create a very dark and intense story.
You can expect diverse interpretations of the character Gildarts in a gay relationship context. Some may focus on his relationships with other existing characters in new ways, while others might introduce original characters. It really depends on the creativity of the author.