Well, it's a really tough call. But some might say Goku from Dragon Ball is the strongest. He has the ability to reach extremely high power levels through intense training and various transformations. His Saiyan blood gives him an edge, and he has fought against some of the most powerful foes in his universe and come out on top. Plus, his Kamehameha wave is a very iconic and powerful attack.
Drogon from 'Game of Thrones' is a very strong dragon. He grew to an enormous size and his fire was extremely hot and destructive. He was a key factor in battles and could easily take on large numbers of enemies.
Another strong robot is Gort from 'The Day the Earth Stood Still'. Gort has incredible power, being able to disintegrate weapons and is highly resistant to attacks. It is a menacing and powerful presence in the movie.
Xena, Warrior Princess, is among the strongest fictional females. She is a master of combat and has a strong sense of justice. Buffy Summers from 'Buffy the Vampire Slayer' is also very strong. She battles vampires and demons regularly. Then there's Captain Marvel in the Marvel universe. With her powers, she can take on powerful enemies and is a symbol of female empowerment.
One could argue that Superman is among the strongest. He has superhuman strength, can fly, has heat vision, and is nearly invulnerable. He has saved the world countless times in the DC comics universe and has faced off against some of the most powerful villains.
In the world of fiction, characters like Thanos are also extremely powerful. He has the Infinity Gauntlet which gives him the power to control reality, time, and space among other things. He can wipe out half of all life in the universe with a snap of his fingers. His strength and the scope of his power are truly terrifying.
In fiction, characters like Thor from the Marvel universe are very strong. He wields his enchanted hammer Mjolnir and has the power of lightning. He has faced many powerful enemies and held his own. Then there's Hulk. His strength increases as he gets angrier, and he can smash through just about anything. In the world of Middle - earth from Tolkien's works, Morgoth was an extremely powerful character in the lore, though he was ultimately defeated. But his power was such that he could cause great destruction and corruption.
In the realm of Japanese manga and anime, Saitama from 'One Punch Man' is a very strong character. As his name implies, he can defeat any opponent with just one punch. He has trained so hard that he has broken through all his physical limits, and no enemy has been able to pose a real challenge to him so far. His strength is a kind of comical extreme in the world of anime characters.
In the world of One Piece, Dracule Mihawk is often considered a very strong swordsman. He has the title of 'Hawk - Eyes' and his swordsmanship skills are so great that he was once the world's greatest swordsman. He can cut through huge ships with ease using his sword, Yoru, and his battles against other powerful characters are quite epic.
The Flood from Halo could be considered as some sort of zombie - like creatures. They are highly adaptable and can infect other species, spreading rapidly. Their numbers can quickly overwhelm any opposition, and they have different forms, some of which are very large and powerful.