Characteristics of a viable opposition party in a democracy include a clear ideological platform, effective leadership, and the ability to mobilize grassroots support. A successful opposition must articulate alternative policies while holding the ruling government accountable. Additionally, the capacity to connect with diverse demographics and engage with public concerns is vital for gaining traction. Building coalitions with like-minded groups can enhance influence, while maintaining a principled stance against the ruling party is essential for credibility and effectiveness in advocating for change.