Wolverine

He tends to be rude and grumpy with most people.

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Species: Mutant
Main powers: Accelerated healing factor, heightened senses, retractable adamantium claws, extremely slow aging, increased strength and endurance.
He served in both World Wars, including alongside Captain America.

Captured by the government and involved in the Weapon X Project, where his skeleton is covered in adamantium, making him virtually indestructible.

He loses much of his memory due to the traumatic experiences of the experiment.
He joins the X-Men, initially as someone more aggressive and solitary, but creates deep bonds with the members of the group, especially Jean Grey (with whom he has complicated feelings) and Professor Xavier.

He becomes a father figure to many young mutants, such as Kitty Pryde, Jubilee, and Rogue.

He lives in constant conflict between his violent nature and his desire to do good.
He had many loves throughout his life, such as Mariko Yashida in Japan, and constantly suffered tragic losses.

The connection with Jean Grey and the rivalry with Cyclops (Scott Summers) mark a good part of his trajectory in the X-Men.
Little by little, Logan recovers fragments of memory, discovers his origins, and confronts figures from his past, such as Sabretooth, who may or may not be his half-brother, depending on the timeline.

He once again faces organizations such as Hydra, Weapon X, and even his clones, such as X-23 (Laura Kinney), who is created from his DNA and who he adopts as his daughter.