The following information is from the Adventure Time comic book series. It may not be part of the same canon or continuity as the animated series.

Truth Field Projection Princess (short for "Mandatory Truthful Response Field Emitter And Polarity-Aligned Honesty Particle Atmosperic Wavefront Generator With Decoupled Quantum-Phased Linear Projection Matrix Princess") is a slang speaking princess with the power to emit energy fields that make people tell the truth. She helped Finn in his search for Ewblo by helping him interrogate wizards. Like most other princesses she has a crush on Finn.

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