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.
In my opinion, it might come down to strategy. Natsu is fierce and has raw power, but Gildarts is experienced and has more battle wisdom. So, it's a toss-up.
I think Natsu would win. He's got powerful magic and lots of battle experience.
I think Natsu would win. He's got that powerful fire magic and a never-give-up attitude.
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 hard to say for sure. Both versions of Erza are incredibly powerful, and it could come down to their current state and strategy in the fight.
It's hard to say for sure. Natsu is powerful, but Sting and Rogue are no pushovers either. It could come down to their strategies and powers at that moment.
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 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.
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.
It's hard to say for sure. Both Gray and Silver have their unique skills and strengths, so it could go either way depending on the circumstances.