I feel like Superman is the obvious answer here, except for the fact that eventually everyone on earth will die and you’ll be left as the last man on earth all by yourself unable to die.
Discussion
Was superman immortal? Man Idon't know enough about comic books
He’s immortal for as long as the sun is yellow I think
Oh interesting. At least he doesn't have the problem of getting stuck somewhere and not being able to get out
He is immortal as long as ANY star produces the radiation that powers his cells. The comics have him standing on Earth as Sol expands to consume it, and all the way down to the heat death of the universe itself, although if we wanted to be exact about it that would be the end of the Stelliferous Era.