Power-wise:
* The Sentry: With superhuman strength, flight, energy manipulation, and near-invulnerability, the Sentry is one of the most powerful heroes in Marvel. His powers are similar to Superman's, but he also struggles with mental instability and dark impulses.
* Hyperion: A powerful and arrogant hero with near-identical powers to Superman, Hyperion is a member of the Squadron Supreme, Marvel's version of the Justice League.
* Blue Marvel: A powerful hero with immense strength, flight, energy blasts, and durability, Blue Marvel is a complex character who has faced discrimination due to his powers.
Personality-wise:
* Captain America: While not as powerful as Superman, Captain America shares his moral compass and unwavering commitment to doing what's right. He represents the ideal of a "true hero."
* Thor: A god with incredible strength, flight, and energy manipulation, Thor also embodies a sense of justice and responsibility.
Other interesting comparisons:
* The Hulk: While not as traditionally "heroic" as Superman, the Hulk's immense strength and destructive power, coupled with his internal struggle, provide a unique comparison to Superman's power and responsibility.
* The Thing: The Thing's unwavering loyalty to his friends and his gruff exterior, despite his heart of gold, have echoes of Superman's dedication to protecting the innocent.
Ultimately, it's important to remember that each Marvel character has their own unique story and motivations, and their similarities to Superman are more like points of comparison than exact duplicates.