Depending on the player's reputation with the Legion upon meeting Gabban, the player will be attacked by Gabban and his party or will be recognized by Gabban for their favors done for the Legion.
Gabban's dialogue within Nipton is nearly identical to Vulpes Inculta's, differing only when Gabban refers to himself in addition to some minor punctuation changes. Also, he provides much more information about the Caesar's Legion than Vulpes, can be directly asked about Lanius for example. However, Gabban is unable to give the quest Cold, Cold Heart.
Gabban has the same face model that Dead Sea and Alexus have, but Dead Sea and Alexus do not appear unmasked in normal gameplay.
Unusually for a soldier, Gabban is completely unarmed.