Maiza Avaro

Bookkeeper of the Martillo family and one of the Advena Avis immortals. His younger brother, Gretto, was one of the first to be "devoured" for knowledge of the elixir's recipe.

[Spoiler] In the 1970s, he leaves his post as bookkeeper to Firo and along with Czes begins searching for the rest immortals to inform them of Szilard's death. [/Spoiler]

(Source: Wikipedia)