In the Marvel Multiverse, Thanos was probably the strongest. In Marvel Comics, Thanos was a villain with the power of the Infinity Gem. He could destroy everything by using the Infinity Gem. Although Thanos 'body was very strong, he had a weakness. The power of the Infinity Gem could make him unable to recognize himself or even cause him to lose his own strength. Therefore, although his body was very strong, he was not the strongest person in all situations.