The spirit of Zangetsu appears as a tall, lean-built, and stoic middle-aged man. He has pale skin, high cheekbones, stubble, and long ragged black hair with brown highlights. His attire consists of a tattered white dress shirt with an upturned collar and cuffs, black pants, low-heeled boots, and a long, amorphous black overcoat with a burgundy highlight that flares out into ragged ends. He wears brown-tinted, semi-transparent wraparound sunglasses.
In his Bankai form, Tensa Zangetsu resembles a teenage version of himself, closer to Ichigo in height and age, with a noticeably slimmer build and slightly shorter hair. His attire is a more defined, robe-like version of his Shikai form's overcoat, minus the undershirt and sunglasses and with the addition of white lining and a hood.