Nile

Nile is one of the original immortals.

Chronology
Nile is an alchemist who studied with fellow immortals Denkuro and Zank Rowan (though they did not become immortals until much later). Nile was named after the river where his family was born - the Nile River in Egypt.

1705 the Ironic Light Orcastra
Zank Rowan mentions that he wants to burn down Lotto Valentino for the usage of drugs and that it was the reason he was not sent their to speak with Dalton. He was aboard Advena Avis along with fellow alchemists. Like other passengers, he drank The Grand Panacea and gained immortality. After Szilard Quates failed to devour Sylvie Lumieres, Nile is the one who confronts him and cut Quates' arm cornering him with Maiza and Denkuro.

2001 the Children of the Bottle
Later in the 2002 timeline Nile is one of the surviving Advenna Avis Immortals. He joins Maiza, Czeslaw, and Silvie to look for Elmer. He now wears a mask, and rashionalizes it at so that nobody would acidentally eat him in their sleep.

When the immortals first reach the town lost in time, Nile is asleep in the trunk, and it is not until later, that he is woken up, accidentally having been forgotten in the trunk by his companions. They are than saved by Phil and brought to the castle Elmer is staying at.

When Elmer greets the door to see who is their Elmer does not recognise Nile because of his mask.

Nile and co than stay at the abode in order to discover what Elmer is keeping, all while playing his game of trying to capture him. Eventually he and Maiza stumble upon the library where they dicover notes on Homunculi and their creation.

Finally after cornering Elmer, they are taken to the research lab where Phil and Dez where born. They are introduced to Bild Quates and it is explained about what Szilard attempte to do in this city all those years ago.

Nile later confronts Felt, and defeats his original body along with Maiza, saving Silvie.

Afterwards he accompanies Felt, Phil, and his other companions now joined by Elmer back to New York.

Trivia

 * In one point of the series Nile fought Shizuo Heiwajima (From Durarara!!) and the battle ended in Shizuo's favor.