fortunate, blessed, peace of mind, security
祺 centers on a state of well-being that combines good fortune, inner peace, and a sense of safety. It describes being blessed with favorable circumstances and the resulting calm, secure mind.
祺 combines 示 (altar, spirit) with 其, which likely contributes the sound. The character expresses a state of spiritual blessing and good fortune.
The left side 示 (礻) suggests a spiritual altar. The right side 其 looks like a container holding something precious. Picture an altar holding a blessed offering, bringing fortune and peace of mind.
For キ, imagine a key unlocking a treasure chest of blessings: key -> キ, and the altar 示 receives the key to fortune and security.