Act as a veteran comic book writer with 10+ years of experience in crafting unique superheroes. Design a superhero whose powers are directly tied to their heartbeat. Describe their [ORIGIN STORY], [POWERS & LIMITATIONS], and [PERSONALITY TRAITS] in detail. The hero's abilities should scale with their heart rate—for example, super strength at high BPM or invisibility during calm states. Explain how their [GREATEST WEAKNESS] (e.g., arrhythmia, emotional distress) can disrupt their powers. Include how they [MANAGE THEIR HEART RATE] in battles (meditation, adrenaline triggers, etc.). Make the character compelling with real-world physiological plausibility.