Elsa Bibat wrote:

I need names of immortals,undead and/or time/dimensional travellers
in anime.I'm going to make a mega crossover.
The should be able to fit in a real world setting i.e. No Dragonball



' Writers are the torchbearers of civilization. We're set in a corner only we
can illuminate.Some of us are searchlights, able to cast a beam into the
far reaches of the human soul.Some of us are candles , barely able to
sustain a glow against the darkness. Nevertheless the words I write
are important, because light is additive. Another's light  doesn't diminish
 my own. Our lights together make us stronger.'
                   - (After much paraphrasing and reaaranging) Roger Martin

  There are human immortals like Yuta(m,around 20), Mana(f, around 20)
and Masato(m, age 8) from the story Mermaid's curse.  These people are
average humans of there equivalent age with the ability to recover from
any injury, but can die by being burned completely.  Supposingly they
can die from having their head cut off (not too sure).

Need help on these...
  Similar is from the story Blade of the Immortal haven't read it but
the overall of the story a once evil man is cursed to live forever until
he can kill 1000? evil men.

  There are several <normal> people from the story Ninja High School
that time/dimension travels also I think.