shine
煕 centers on giving off light: shining, glowing, or being bright. The idea extends naturally to spreading light or clarity, and to the warmth and joy that light can bring.
煕 is a variant form of 熙. The top component 巸 likely combines 臣 and 已, while the bottom 灬 is a fire radical, suggesting brightness or shining from fire. The exact historical development is uncertain.
The top part 巸 looks like a minister (臣) standing beside a completed task (已), while the bottom 灬 is fire. Picture a minister holding a torch aloft, making everything shine brightly.
For キ, imagine a key that unlocks a bright, shining treasure chest: key -> キ, and the light spills out.