|“|| His name's Alby. He's an Albino, so, Alby.
Alby is Jr.'s pet dog, an albino chihuahua with violet eyes.
Xenosaga Episode II: Jenseits von Gut und Böse Edit
He is first seen in the end credits of Xenosaga Episode II: Jenseits von Gut und Böse. Jr. obtains Alby soon after his twin brother, Albedo's death, and requests to allow him on the bridge of the Durandal. Although Jr. claims the name is due to the dog being an albino, it is likely that Alby is derived from Albedo, as Jr. tells Mary Godwin, "I hope he doesn't misbehave like someone we know." It is believed Jr. acquired the dog as a means of coping with his brother's death. Alby has white fur/hair and violet eyes, similar to Albedo.
It is unknown whether or not Alby is a "real" dog, which are considered rare and expensive in Xenosaga's current era, or a more common synthetic dog, similar to Nex. However, Jr. would certainly be able to afford a real dog if the former is true.
Xenosaga Episode III: Also sprach Zarathustra Edit
In Xenosaga Episode III, it is remarked in the database that Alby does not like Gaignun Kukai, but adores Rubedo, similar to how Albedo feels about his brothers. After the destruction of the Durandal, Alby takes up residence in the women's cabin on the Elsa. Somehow, he is able to use the EVS, and returns to the simulated Durandal, which results in a sidequest where he leads the player around the ship (somehow he can use trains too) until retrieving MOMO's best weapon and an accessory that was hidden in the Durandal Park.
At the end of Episode III, Alby remains with MOMO on the Dämmerung, waiting for Jr. to return home.