A (Adoptive Brother)
Killer B has dark skin and a muscular build, as well as blonde hair and a goatee. On his right shoulder, he has a tattoo of the kanji for "iron" (鉄, tetsu), which is the Iron Armour Seal that was used to seal Gyūki into him, and on his left cheek, he has a tattoo of a bull's horn (correspondingly, the Gyūki has horns like a bull, and the left one is partially missing). His top lip also has a slightly darker hue than his bottom one. Killer B wears oval shaped sunglasses and a white-coloured forehead protector. He also has his village's standard one-strap-over-one-shoulder flak jacket, and a long, red rope belt tied around his waist, the standard Kumo hand and shin guards, shinobi sandals, and a white scarf around his neck.
Killer B is very proud of his own power and also very proud of who he is. B has a special way of expressing his pride through song, more specifically in rap-style and tends to use "Bakayarō! Konoyarō!" (「バカヤロー!コノヤロー!) when referring or speaking to others.