It's hard to say for sure. Both Sukuna and Gojo are incredibly powerful, and it could depend on various factors like their current state and the circumstances of the fight.
It starts at a specific point in the manga, but I can't recall exactly without looking it up. You might want to check some manga forums or dedicated fan sites for the precise chapter.
Superman is extremely powerful on his own. His powers are almost god - like. But the Avengers have a lot going for them too. For example, Iron Man has his high - tech suits which can adapt to different threats. Captain America is a great strategist. In a fanfiction, it could depend on the circumstances. If it's a fight in an environment full of kryptonite, the Avengers would have an advantage. But in a normal battle, Superman's power might be too much for the Avengers to handle all at once.
Well, it really depends on how the fanfic is written. If the fanfic focuses on Naruto's weaknesses and Danzo's preparedness, Danzo could potentially win. He has a lot of political power and experience. However, if it follows the general power scale of the Naruto universe, Naruto has a better chance. His positive energy and the power of friendship (a bit cheesy but true in Naruto's world) often help him overcome his opponents. Naruto also has the ability to quickly adapt to new situations, which would be a big plus against Danzo.
It's hard to say for sure. The kirin has speed and agility on its side, but the rajang has raw power. If the kirin can keep dodging and wear the rajang out, it might win. However, if the rajang manages to land a solid hit, it could be over for the kirin.
In a 'Goku vs Beerus' fanfiction, it's really hard to say who would win. It could depend on how the author wants to write it. If the author wants to show Goku's growth, Goku might win through some new transformation or power - up. But Beerus is a powerful God of Destruction, so he also has a great chance of winning.
It's really hard to say who would win in a 'naruto vs avengers fanfiction'. Naruto is extremely powerful with his ninjutsu and his ability to summon large toads. But the Avengers also have their own powerful members like Captain America's leadership and combat skills, and Thor's godly powers. It could go either way depending on the situation.