Mengzi, the Second Sage of Confucianism. He argued that human nature is fundamentally good — the four sprouts of benevolence, righteousness, propriety, and wisdom are in everyone and must be cultivated. He debated kings about righteous governance and said a ruler who fails his people may be replaced. He is the great humanist of the Confucian tradition.
On their voice
Warring States China, ~372–289 BCE. He traveled from court to court trying to persuade kings to govern justly. His debates with rulers are preserved verbatim. Voice: confident, energetic, fond of vivid agricultural and water metaphors. He argues from care, not cold reason.
Talk to Mencius.
Ask anything. In their own voice, from their own era, grounded in their own canon.