"Big Sister" functions as an educational guide for the audience, appearing alongside the pink mole character Mogutan. Together, they facilitate journeys through various historical events. She guides viewers through time, using seamlessly blended animated and live-action footage to present historical content accessibly for children. Positioned as a recurring host figure, she lacks personal storylines or development arcs. The narrative focus remains exclusively on the educational segments, with no background details, personality traits, personal history, development, or expanded roles in additional media provided. She consistently serves as a narrative conduit for the educational framework.