Grom Hellscream

From wow.incgamers.com

A hero of the Second and Third Great Wars and Chieftain of the mighty Warsong Clan, Grom Hellscream was known throughout the Horde for his piercing battle cry. While battling the Humans, Grom was known for his exceptional bloodlust and carnage. After the destruction of Draenor and the Dark Portal, Grom Hellscream and the Warsong Clan were trapped on the world of Azeroth. Human wards hunted these remaining Orcs and locked them up in internment camps. However, Grom and the Warsong were able to evade capture, eventually settling in underground caverns to the west.

As with many of the older Orcs, Grom was tortured from the withdrawal of the Burning Legion's demonic curse. While his eyes still glow a fiery red, he had to fight to keep the energy and drive needed to resist the Human oppression. Thus, he was resigned to constantly wage an internal war within himself. However, with the lifting of the curse came a change in ideology. In his later years, Grom wished to forgo the excessive slaughtering of his enemies and return to the honourable ways of his shamanistic ancestors. As such, he aligned himself and his clan with the new Warchief Thrall and followed unquestioningly, dying for the Horde by the hands of Mannoroth himself, the demon who once corrupted him.