Canary serves the Zoldyck family as a servant. Though she doesn't fully recognize it, she and Killua are genuinely friends—but she's convinced their difference in status makes that impossible. It's a barrier that exists mainly in her head.
When Gon spotted her with Killua's skateboard, her story shifted. First she claimed it was a gift, but later admitted he'd actually dropped it. The skateboard becomes this small symbol of their actual closeness, at odds with how she sees their relationship.
There's a moment that sticks with her: Killua tried giving her the tiny skull from his staff. She refused it at first, but he wouldn't take no for an answer—he just tossed it at her feet and took off running. It's the kind of thing a friend does, though she'd probably never describe it that way.
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