Ehrlich Kruger holds the position of vice-captain aboard the *Jotunheim*, a former civilian passenger transport converted into a military vessel during the One Year War. His longstanding professional partnership with Captain Martin Prochnow originated prior to the conflict, when both served the ship in its civilian operations.

As a lieutenant commander within the Principality of Zeon’s 603rd Technical Evaluation Unit, Kruger provides operational support for the *Jotunheim*, though extant records lack specifics regarding his day-to-day responsibilities or direct battlefield participation.

Available sources do not elaborate on his background, personal motivations, or interactions with documented crew members such as Engineering Lieutenant Oliver May or test pilot Monique Cadillac. His role remains defined by hierarchical command functions and logistical oversight within the ship’s military framework, with no recorded accounts of activities beyond the war or expanded universe narratives.