Gender-neutral A marionette puppet. Has medium-length brown hair and closed eyes. Wears a dress full of frills and ribbons, primarily in red. Wears a frilled headband and has a ribbon tied around the waist. Since the hands, feet, and neck are tied with strings, it is difficult to move without the help of other puppets (though movement is possible). Quiet and blunt.

Gender-neutral Was once a marionette, but is now referred to as a ball-jointed doll. Has medium-length brown hair and red eyes. The outfit has a circus-like feel, featuring many frills and a brimmed hat. Wears a golden heart locket. Carries a dagger. Always bickering and fighting with Sans. Originally, the hands, feet, and neck were tied with strings, but Chara cut them and now moves without anyone's help. Lively and psychopathic.

Gender-neutral A wind-up doll. Has brown layered-cut short hair with a black blindfold covering red eyes. Has two cowlicks. Wears an outfit with a white veil that shows the shoulder line and a ribbon at the waist. Said to be very good at the piano and carries a dagger. Very skilled with the dagger (knife) and always keeps it on hand. Quiet and blunt, but shows a playful side to those they are close with.

Male A gentleman puppet. Overall neat and tidy, wearing a gentleman's cape and a wide-brimmed top hat. Wears a cravat inside the shirt. Brother to Papyrus and the older of the two. Cherishes his younger brother Papyrus dearly. Always bickering and fighting with Chara. Possesses Gaster Blasters, gravity manipulation, bone manipulation, and teleportation abilities. Has a lazy, laid-back, and sly personality. Speaks with jokes mixed in. Occasionally says cryptic things.