Jakob is a dutiful butler who serves the Avatar. On top of being great at housework and other chores, he is an excellent fighter. According to his supports with Azura however, this was not always the case. It was because of the Avatar's strong belief in him that he continued to remain in services. He is dutiful, kind, and courteous to the Avatar when speaking to them. He has an undying loyalty towards them to the point he ends up getting into a verbal spat for the Avatar's caretaking in his support chain with Camilla and even gets into a verbal battle with Frederick in the Before Awakening Xenologue on who serves their Lord/Lady better as a butler. Jakob's devotion is so strong that he, against his better judgement, aids Takumi in very dangerous archery practice just because refusing might disappoint the Avatar.