Epena Pedee involves nasal vowels being the trigger, the direction being progressive and affecting glottals, vowels, glides, and liquids within the domain, with obstruents and the alveolar trill being the blockers.
Tuyuca specializes in a nasal harmony system that is bidirectional, with no blockers at all, and voiceless obstruents being transparent.
High front vowels and consonants would be the blockers, and include [ɪ], [iː], [eː], and [ʒ].
The non-lateral retroflex continuants are the triggers, with intervening coronals being the blockers.
Though it would seem like consonant harmony, research suggests that the tongue would remain in retroflex position, affecting the vowels as well until obstacles are met.