Monkey D. Luffy is extremely strong, regarded as one of the top 5 strongest characters currently alive in the One Piece world. His strength dramatically increases with his Gear 4 and Gear 5 transformations, allowing him to punch through massive enemies and structures, sustain high durability, and exhibit immense speed and agility. In Gear 5, Luffy is essentially unbeatable within the form's time limit, possessing power that can contend with some of the most formidable foes, including creatures like Kaido. His physical strikes can shatter buildings and withstand severe attacks, showcasing strength that can move and damage objects weighing hundreds of thousands of tons. Despite his low intelligence and tendency to rush into battle, his haki and physical prowess are top-tier, and he ranks in the league of the strongest pirates, near figures like Shanks and Mihawk. His growth is continuous, and he benefits from unique abilities tied to his devil fruit and haki mastery, making him one of the most powerful characters in the series.