Susan is a female human. Her skin tanner than Finn's skin, and she has long blond hair, seen down her back, and green eyes. Part of her hair is shown to be shaved off around the implant on her head. She wears a ragged, short purple dress and a dark-grey hat made to look like the head and body of a cat with long whiskers and tail. It is later learned that this hat is part of a uniform that designates her as a 'Seeker.' True to her name, she is physically incredibly strong, being able to crush boulders and fight off monsters by herself. She doesn't appear to own shoes, so she is seen mostly walking barefoot.

verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair))