She's always been an odd duck, but we love her quirky personality.
strange bird
Frequency:
60
%
He's a bit of a strange bird, always coming up with unusual ideas.
peculiar fish
Frequency:
45
%
He's a peculiar fish, but he's harmless.
Idiomatic Expressions for queer fish
Phrase: a queer fish in a strange pond
Meaning: a person who stands out or doesn't fit in with their surroundings
Usage: She felt like a queer fish in a strange pond when she moved to the new city and didn't know anyone.