It really depends on the specific circumstances. If the fantasy side has powerful magic, like being able to conjure up huge firestorms or turn the ground into quicksand under the modern army's feet, they could win. But modern armies have advanced weaponry like missiles and tanks. If they can quickly figure out the weaknesses of the fantasy elements, they might prevail.
In a straight - up fight, Batman might seem more likely to win. He has more experience and a wider range of skills. He has trained Nightwing, so he knows his fighting style well. However, Nightwing is younger and more agile, which could give him an edge in a fast - paced battle.
Naruto would likely win. Godlike Naruto implies he has extraordinary powers. Naruto has strong chakra reserves, and his signature jutsus like Rasengan are extremely powerful. Also, his ability to quickly adapt in battle gives him an edge over Orochimaru.
Thanos is extremely powerful with the Infinity Stones. However, Tony Stark has a history of coming up with solutions against seemingly unbeatable odds. In a fanfiction, the author might give Stark an edge by having him discover a hidden weakness of Thanos or develop a new weapon that can neutralize the Stones' power. So, it's possible for Stark to win if the story is written in a way that emphasizes his ingenuity.
In a 'chara vs gaster fanfic', if the victory is determined by who has the stronger will, it could be a long - drawn - out battle. Chara has a strong will born out of their experiences, but Gaster's will might be equally strong considering his enigmatic nature and whatever his goals are in the story. It's really up to the creativity of the writer to decide who emerges victorious.
It really depends on the context. If it's a physical fight based on brute strength, Naruto would likely have the upper hand. He has access to the Nine - Tails' chakra which gives him superhuman strength. But if it's a fight that involves strategy and medical ninjutsu, Sakura could potentially win. She's a very intelligent fighter and her medical skills could be used in a creative way to disable Naruto.
It's hard to say. Naruto has his powerful Nine - Tails Chakra and Sage Mode. But the five kages are also very strong. However, Naruto has a habit of coming out on top in tough situations, so he might be the likely winner.
In most traditional interpretations, Itachi would be favored to win due to his long - established reputation as a powerful and feared ninja. But in the realm of fanfiction, the writer can tip the scales in Sakura's favor. For example, if Sakura has mastered some sort of anti - Sharingan technique or has a power - up that nullifies Itachi's main abilities, she could emerge victorious.
In a fanfic, it really depends on how the author writes it. But if we base it on the original series' power scaling, Naruto has a higher chance of victory. He has learned from many battles and has a wider range of abilities compared to Jiraiya. Also, Naruto has a strong will that could give him an advantage when facing his old master in the Edo Tensei form.
Ash. He has that underdog spirit and has overcome so many challenges. His bond with his Pokemon is really strong, which gives them an edge in battles.
It depends on how the OC is designed. If the OC has super - powerful and rare Pokemon, it might have an edge. But Alain is a very experienced trainer, so he could also win with his battle smarts.