Your mystery plant is a variegated Hoya, commonly called wax plant. The pink/white leaf margins and thick, succulent-like leaves are characteristic.
Unless you live where winter temperatures never drop below 45°F (7°C), keep it potted. It can summer outdoors in a container but must come inside before cool nights.
Hoyas are semi-succulent—err on the side of underwatering. They bloom from the same spurs (peduncles) year after year, so never remove the flower stalks after blooming. With good light and restrained watering, mature plants produce fragrant star-shaped flower clusters.
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