Leaders who are constant display persistence, consistency, faithfulness, and they are unchanging.
When leaders are persistent, they are resolved, driven with purpose. Leaders who are consistent represent stability that is dependable. A faithful leader demonstrates loyalty and devotion. The unchanging character of a leader provides enduring, yet predictable follow through.
Obviously, more could be said about each of these, but the overall focus is defining the constant nature of leadership and how it looks within the perspective of followers.