Idioms and colloquial expressions:
1. Lone wolf: A person wo likes to be alone.
2. Cold fish: A person who shows no emotion.
3. Night owl: A person who stays up late at night.
4. Social butterfly: A person who enjoys socializing and easily interacts with others.
5. Tough cookie: A strong and resilient person.
6. Wet blanket: A person who spoils the fun or mood.
7. Bookworm: A person who loves reading.
8. Couch potato: A lazy person who spends time sitting or lying down, often watching T.V.
9. Dark horse: someone who surprises others with unexpected success.
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