He is selfish and cares mostly for himself, as seen when he abandoned Finn on the collapsing Crystal Citadel and when he showed no remorse for one of the collapsing Citadel Guardians. Like Finn, he is shown to be very persuasive, as he was able to convince the other escaped convicts to make him their leader. He seems to not have any real interest in Finn or to explain why he abandoned him in the first place, as he simply used his status as his father to make Finn help him, avoided answering Finn's question and even blamed the separation on Finn. There is a possibility that Martin may not have known about his son, even with the revelation that he had a son. Martin showed little care for him, unless it helped him escape.