If we discount magic increases and only consider training or innate power.
-Saitama became the strongest man in his world in 3 years. (One Punch Man)
-The friends who Yusuke made in the tournament, went from being Class C to being class S in only 6 months. (Yu Yu Hakusho)
-Wonder Woman happened of be only slightly stronger than an average Amazon, to be Superman level. (Wonder Woman movie)
-Goku in little more than a year, step from being weaker than a Saibaman to being more powerful than the emperor of the universe. (Dragon Ball Z)
-Gohan in the hyperbolic time chamber went from being a little stronger than Krillin, to be at the same level as his father.
-Characters in role play games of through level 1 to level 100. (RPG games)
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