Kitty White, widely recognized as Hello Kitty, presents as an anthropomorphic young girl with feline features rather than a literal cat. Her birthplace is the London suburbs, where she lives with parents George and Mary White and her identical twin sister, Mimmy White. Her family extends to grandparents Anthony and Margaret, and she cares for a pet cat named Charmmy Kitty. Her romantic partner is Dear Daniel.

Physically, she stands five apples tall and weighs three apples. Her design features a white complexion, no visible mouth—enabling emotional projection by others—and a signature red bow on her left ear. Sanrio states she communicates "from the heart," transcending language barriers. Her classic attire includes blue overalls over a yellow shirt, though this varies across depictions.

Her personality radiates brightness, kindness, and purity, coupled with a spirited tomboyish streak. An eternal optimist, she believes steadfastly in achieving her ambitions. Hobbies encompass traveling, music, reading, baking cookies (despite self-assessed culinary shortcomings), and savoring her mother’s apple pie. She collects tiny cute objects and excels academically in English, music, and art. Long-term goals include becoming a pianist or poet. Friendship anchors her philosophy, epitomized by her motto: "You can never have too many friends." This ethos aligns with Sanrio’s vision of her as a symbol of human connection, her red bow embodying these bonds.

Her age fluctuates across Sanrio media: she appears as a kindergarten or elementary student in some iterations, while others depict her as an independent adult managing a store or living solo. Despite these contextual shifts in maturity, her core traits and visual design remain unwavering.