Pin is strong-willed, determined, but often vengeful. She's vocal about her frustrations towards those who disrespect her (mostly FreeSmart). Her increasing temper issues and competitiveness culminate in BFDIA 18, where she chooses to sabotage Book and win rather than help Coiny, her only friend in the competition. Pin resembles a standard pushpin. She has no arms and has triangular mechanical rollers that allow her to stick and climb up walls with a green battery pack that powers the rollers.