wise
慧 centers on deep, perceptive wisdom: the ability to see clearly and understand quickly. It describes a sharp, insightful mind.
慧 combines 彗 (a broom or comet, suggesting sweeping clarity) with 心 (heart/mind), conveying a mind that sweeps away confusion to reveal wisdom.
A broom (彗) sweeping over the heart (心) clears away mental clutter, leaving a wise and perceptive mind.
For ケイ, imagine a wise old sage named Kay who sweeps away ignorance with a broom: Kay -> ケイ, and her wisdom clears the heart.