Does it even have to be someone who's Christian, or someone known primarily as a Christian leader?
For example, there's Gandhi, who wasn't Christian but has influenced many Christians, including, Martin Luther King... who was a minister but is known much more for his civil rights work.
That's a fair answer if his teachings have helped form your Christian beliefs.
I don't typically think in terms of particular people when thinking about my faith. If pressed, I'd pick Martin Luther despite his many faults and my many points of difference with his beliefs.
Yeah its fair enough to say that you shouldn't have to hallow a certain person, but there is no doubt that you would have the faith you have today without the influence of many people since Jesus' death.
Do Mormons count as Christians?
For this thread yeah.