Fowler.

Fowler is a powerful man who enjoys brutalizing others for his entertainment. His crass, direct personality and an ever-growing appetite for women, wealth, and extreme violence repulse even the ruthless men who secretly court his goods and services. While he acknowledges the merit of and has grown proficient in the fine arts of Japan, he treats them with contempt. Eternally impatient, he grows bored without something to dominate, whether through commerce, sex, or conquest. Any time spent idle, to him is time wasted, and his mercurial temperament can go from amused calm to wild rage, and back again on a moment's notice; this most likely has not been helped by twenty years of near-total confinement within a dark, isolated fortress. Despite this contempt for non-white culture, he utilizes Japanese-taught combat skills and weapons on several occasions, though often combining them with his bulk and additional Western weaponry. He contributed to some parts of the gauntlet of torture traps and dangers lining the various levels of his castle.

Abijah is of imposing stature, with a heavy-set, stocky build - atypical of many Irish men. He has long red hair streaked with grey, falling past his collarbone, though the front is cut short. Fowler has bushy eyebrows, sharp, angular features, and high cheekbones, light green eyes.

Peak Human Strength: Abijah's physical strength is at the very peak of human potential, making him consistently able to perform impressive feats such as crushing a man’s head with one blow. Taking into account that it was a warm-up; it can be considered that he is able to push his body much further. Given his immense strength, he is strong enough to break bones.

Master Tactician and Strategist: Abijah is a master accomplished tactician and strategist. It seems he was always one step ahead of everyone around him, even commanding an army with Shindo to overthrow the Shogun within an hour.

Master Marksman: Abijah is a highly proficient marksman and well-versed in the use of firearms, particularly flintlock rifles fired at a far distance.

Fowler has fathered many children with various Japanese prostitutes brought to service him over the years, but refers to them as "bastards" and "half-breeds", and has either ordered them and their mothers killed or done the job himself, showing that despite his childhood closeness to his sister, he has no qualms about murdering children now. When infiltrating his castle, Mizu sees their bones lining the entrance tunnel, something Fowler later brags to her about. He doesn't deny that Mizu might be his daughter, but claims (based on her height and eye color) that she was more likely fathered by one of his remaining fellow white traders, Skeffington and Routley. However, given she has overpowered him and is holding a knife to his throat at the time, he may be saying whatever is needed to make her keep him alive, indicating his cowardice.

Fowler appears to be afraid of fire. Despite usually being calm and collected in almost any situation, he grows visibly unnerved and flees from Mizu when she sets Edo Castle keep alight around them during their final duel, referring to her as "crazy" as he runs. This fear may stem from his earlier reference to the Tudors burning the O'Neill lands where he lived as a child. He is equally unnerved (but also, in a twisted way, impressed) by Mizu herself, commenting that she inadvertently burned down the world's largest city (Edo) just to get her chance at vengeance against him, and wondering aloud if, based on her sheer ruthlessness, she might be his daughter.

During Fowler and Shindo’s spring procession to Edo the two of them participate in every brothel along the way and in one particular instance Fowler was seen having sex with a man before slitting his throat with a katana. While this could be an indication that Fowler is bisexual it is more likely his love of sexual sadism is so deep, he does not care if he inflicts it upon a man or a woman.

His sexual sadism is demonstrated frequently in his language, comparing his oncoming conquest of the Shogunate to a woman waiting for him in bed, and when he is beating and bear-hugging Mizu to the point that he cracks her ribs, remarks that "your bones break like a woman's" indicating that he has done this to some of the prostitutes sent to him before. As the only women he ever sees in his isolation have been prostitutes Shindo brings to him, he admits his appetite and 'imagination' for cruelty have only grown over the years. He particularly enjoys inflicting pain personally, shown by his indifference during Taigen's torture by Heiji's man in contrast to his savage amusement when pummeling Taigen and Mizu with his own hands.