Tinker Bell serves as Peter Pan's fairy companion and best friend. She communicates using a fairy language Peter alone understands, conveying emotions through expressive body language and wing movements. Her magical pixie dust grants flight to Peter and others in Neverland. Visually, she features a hyper-realistic design with luminescent botanical elements; her dress integrates intertwined plant fibers, midnight flowers, and algae-inspired textures emitting pixie dust, while her transparent wings resemble dragonfly aerodynamics, their rapid, variable beats reflecting her emotional state.

Her narrative functions involve guiding Wendy and her brothers to Neverland, critically intervening during confrontations with Captain Hook, and facilitating escapes through flight. Initially jealous of Wendy, Tinker Bell evolves to assist her in pivotal moments, freeing Wendy from captivity on Hook's ship and enabling her flight during a perilous walk-the-plank scenario. Her relationship with Peter involves profound mutual reliance, with Peter acknowledging her essential role in his adventures and well-being.

The character's creation utilized extensive performance capture technology. Actor Yara Shahidi's facial expressions and physical movements were recorded via FACS (Facial Action Coding System) and specialized body language sessions. This data was solved onto a digital model using machine learning tools, with animators refining subtleties for nuanced performances. Technical challenges included scaling her down to one-twentieth of human size while maintaining realistic interactions with human characters and environments.