Chiku-tan is an enthusiastic person who enjoys inventing things and helping others. Her hair is held with a piece of bamboo charcoal and the end moves when she has ideas, usually during problems. The viewer sees that like Binchō-tan, Chiku-tan also lives far from town in an old house but lives with others, her younger sister, Chiku-rin and her grandfather. She is afraid of ghosts.
Chiku-tan often takes on jobs like Binchō-tan and after meeting, they quickly became friends. Chiku and Binchō also begin raising a dog together. She is named after takesumi; bamboo charcoal, as chikurin means 'bamboo grove'. Her birthday is on August 24.

source: wikipedia