Kayn is a rapper and instrumentalist for Heartsteel. His onstage alter ego is Rhaast. His alter ego wears a white mask with emotive holographic features on it, and is high-energy. He's lazy and slovenly. He's sarcastic, ironic and snarky. He's arrogant, cool, rude, abrasive and ambitious. He hates the paparazzi. He's tall and skinny. He's athletic, but he hates working out. He likes parkour. He has heterochromia, typically wearing an eye patch over his unusually colored left eye.