characteristic, individual, peculiar, distinctive mean indicating a special quality or identity.

characteristic applies to something that distinguishes or identifies a person or thing or class.

individual stresses qualities that distinguish one from all other members of the same kind or class.

peculiar applies to qualities possessed only by a particular individual or class or kind and stresses rarity or uniqueness.

distinctive indicates qualities distinguishing and uncommon and often superior or praiseworthy.

strange, singular, unique, peculiar, eccentric, erratic, odd, quaint, outlandish mean departing from what is ordinary, usual, or to be expected.

strange stresses unfamiliarity and may apply to the foreign, the unnatural, the unaccountable.

singular suggests individuality or puzzling strangeness.

unique implies singularity and the fact of being without a known parallel.

peculiar implies a marked distinctiveness.

eccentric suggests a wide divergence from the usual or normal especially in behavior.

erratic stresses a capricious and unpredictable wandering or deviating.

odd applies to a departure from the regular or expected.

quaint suggests an old-fashioned but pleasant oddness.

outlandish applies to what is uncouth, bizarre, or barbaric.