noun
eccentric person; oddball; weirdo
Refers to a person with unusual habits, ideas, or behavior; often used in a mildly critical or humorous way.
彼は変物だけど、憎めない。
He's an oddball, but you can't help liking him.
あの変物がまた変な発明をした。
That eccentric person has made another strange invention.
変人 is a more common and neutral word for an eccentric person; 変物 is slightly more colloquial and can sound a bit old-fashioned or playful.
Compound of 変 (へん, 'strange') and 物 (ぶつ, 'person' or 'thing'). The exact historical derivation is uncertain, but the word has been used since at least the Edo period to describe eccentric individuals.