Elsa Bibat wrote:

I need names of immortals,undead and/or time/dimensional travellers
in anime.I'm going to make a mega crossover.

  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

How about the Ogreslayer?  He appears to be immortal until he kills all
other ogres.

-- Bob