Sunny disposition
A person that has a "sunny disposition" is frequently friendly and in a good mood.
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Big Bird’s disposition was as sunny as his almost 5,000 feathers. A person that has a “sunny disposition” is often in a good mood, optimistic, and is almost never negative (at least in public). Oprah Winfrey, comedian Jay Leno, and actor George Clooney are all said to have a sunny disposition.