Inuyasha was pushed to his limit in a fight against a demon and lost the Tessaiga. His eyes turned red with teal irises in the formats of a slit with white pupils, his cheeks have jagged purple stripes and his fangs and claws were lengthened. He had transformed into his full fledged demon form and killed the demon with his claws, after doing that he then turned around, the Hanyōu having a look of bloodlust on his face after killing the demon. This is not the Inuyasha you knew