This doll represents a seated samurai or officer, whose face is painted whitish pink and has glass inset eyes and hair tied up at the top of his head. The doll's facial features are painted, including downturned lips and up-pointed eyebrows. The doll's arms are bent in front at chest height and the right hand is open. The doll wears a brown-patterned kimono jacket and a blue and brown patterned under garment, covered by leather armor (a breast plate and back attached with shoulder straps) and panels (two in front and two in back). A dark brown sash belt is tied around his waist and has a large knot in front. This doll is likely meant to be part of a Kodomo no Hi (Children's Day, formerly Tango no Sekku or Boys' Day) festival set.
A composition doll is made of a material called "composition," which is made from a mixture of sawdust, glue, and other materials such as cornstarch, resin and wood flour. Originating in the 19th century, composition dolls were marketed as unbreakable, as the material was sturdier than previously used substances.