individualistic, respective, singular, independent, idiosyncratic, case-by-case, particular, private, personal, several, more...

collective, communal, shared, public, universal

introvert, extrovert, optimist, pessimist, realist, idealist, perfectionist, nonconformist, leader, more...

single, same, particular, private, normal, human, average, healthy, specific, unique, isolated

one of many,   compounds) a person,   one of them,   another person,   taken one by one,   unique person,   one with,   separate distinct,   person or animal,   person or cause