Denkuro

Denkuro is one of the Advenna Avis Immortals, though he was first mentioned in the first volume and later in the fifth volume, his actual appearance and introduction was not until the eleventh volume during the 1700s timeline. He was mentioned as being the only Asian on the Advenna Avis, and is one of the ten surviving immortals in the 2002 timeline.

Chronology
Denkuro is an alchemist from Japan, who studied along with his good friends (and who would later also become immortals) Zank Rowan and Nile.

1705 the Ironic Light Orcastra
Denkuro and Zank Rowan enter the city of Lotto Valentino in hopes to stopping the circulation of a certain drug in the city, and after shortly entering they are met by Spanish Aristrocrats - the Rotten Eggs - who were beating up Elmer C. Albatross and Niki. In advertantly getting involved because of their odd appearance, they easily dispatch them, while Elmer and Niki escape.

Later they encounter Huey Laforet who agrees to bring them to Dalton. Their they discuss their encounter with Rotten Eggs, and Aile (whom Dalton doesn't know), while Elmer and Huey Easedrop on them.

between books/2001 Children of the Bottle
in 2001, Elmer explains what happened to Denkuro ever sense the 1700s. Desiring to return home, while avoiding Szilard, Denkuro opted to take a trek over the North Pole, where he was frozen for many years until he was finally defrosted in the year 2000. When he returned home he met with Elmer.