Sei Shounagon is depicted as a regal Heian-era noblewoman reimagined for the present day. The figure wears a multi-layer kimono that blends silk textures and modern sheen, with a gradient from moon-silver to midnight-indigo, adorned with chrysanthemum and plum blossom embroidery. Her hair is styled in an elegant updo, pinned with lacquered ornaments and a tall feathered kanzashi. She holds a delicate fan in one hand, edged with gold filigree, while the other hand rests at her waist, a poised and slightly mischievous expression on her face. The base echoes a serene Heian garden, with floating petals and carved anko lacquer.

In Fate/Grand Order interpretation, Sei Shounagon is a sharp-witted adviser who records every nuance of courtly life in her Pillow Book. As a Servant, she moves with swift, precise steps, turning etiquette into an art of combat and defense. Her Noble Phantasm draws on the power of memory and rumor, summoning pages that reveal hidden motives and weave truths into spectacle. She confronts rival heroes with a blend of tact and daring, matching elegance against brute force. Her personality is a blend of loyalty to the Emperor and a candid, fearless voice that slices through pretension.