1. His appearance here is like a square peg in a round hole.
2. She is out of step with modern life.
3. Dishonesty is foreign/alien to his nature.
4. Underhand work of that sort is against the grain with me.
5. He felt he did not belong among those people.
6. His ideas were out of tune with the period in which he lived.
7. As a non-golfer, I felt like a fish out of water at the clubhouse.
8. I never fit in at school.