The Toa Ignika always seemed a bit ugly to me, those rubber masks (spikes? Scales!? Teeth???) , the marbled colours (those would be fine if there were more varieties) and the colour schemes of Hewkii and Nuparu were a bit odd.
still they were fine compared to the Toa Hordika, the idea of being mutated could of been much better executed without being garish.
The mataron of mata nui were disappointing in that they had limited colours. And those ab things are gross looking.