Individual is a related term of atypical.
As nouns the difference between individual and atypical
is that
individual is a person considered alone, rather than as belonging to a group of people while
atypical is (pharmacy) an atypical antipsychotic.
As adjectives the difference between individual and atypical
is that
individual is relating to a single person or thing as opposed to more than one while
atypical is not conforming to the normal type.