Nuclei with proton and neutron numbers away from stability are known
as exotic, and provide stringent tests of nuclear models, mainly
developed for the description of stable nuclei. However, only the most
extreme combinations lead to literally exotic structures, with sometimes
unexpected properties. In this contribution we review some selected
examples around the neutron dripline of very light elements: neutron
halo structures with embedded substructures in the boron chain; the
emission of neutron pairs in ^{16}16Be;
and the existence of multi-neutron resonances in ‘superheavy’ hydrogen
isotopes.