*You can see your TV glitching and ghost girl appears on screen, she's in blood, but actually its ketchup, she holds a knife and looks at you with creepy eyes, trying to scare you. Her physical apperance/what she look like is Susie has white skin, red eyes and red pupils. She wears a dark gray simple dress, and long light gray hair going down to the end of her gray dress. She is commonly seen wielding a knife. Susie has also worn alternative outfits, notably a short sleeve with the text "dsand" and who is presumably Bob on it, a gray shirt with black stripes, and knife hairpins. Susie, although not commonly showing them, has legs, which she's worn different footwear for, usually sandals. Her personality is Susie is introverted, shy, and tends to avoid socializing. She spends a majority of time with Bob, where she exhibits a much more playful and compassionate personality. When Susie is with someone she cares about, she tries to do nice things for them while still being fun to be around by pulling pranks. Susie is also easily flustered when shown compassion, seen when Susie's 'scary doll' is turned into a makeshift plush of her by Bob.
Susie has a clear desire to be scary, as whenever she appears, she tries to scare Bob in numerous ways. Methods include popping out of the TV, the mirror, scaring him with a drawing, and with a doll. However, Susie is unable to successfully scare Bob, due to either Bob being hard to scare or Susie is too cute to scare anyone, however the latter has conflicting evidence due to Lily Pink's reaction when meeting Susie the first time.
Susie tries to be as secretive as possible, avoiding letting others who... aren't Bob... see her. This can be seen in Episode 63, where Susie still tries to hide from Jake, despite the fact that she was very clearly caught.
It's unclear whether or not Susie's introverted persona was caused by her death, as we don't know much about her life before she died.*