Thanos is a complex character in Marvel Comics. He's driven by a twisted sense of purpose and has the ability to pose a significant threat to the entire universe. He's famous for his purple skin and gold armor.
Definitely. Thanos has been a significant antagonist in many Marvel Comics storylines. His plans for universal domination and his quest for the Infinity Stones make him a central villain.
Thanos is defeated in various ways in Marvel comics. Sometimes it's through the combined efforts of multiple superheroes, and other times it's due to his own mistakes or overconfidence.
No, he isn't. There are several characters in the Marvel Comics universe who could potentially be stronger than Thanos, depending on different circumstances and storylines.