Donald Reagan was an adventure capitalist who was born in the ukranian experimental city called City 17. There he used his manipulative speeches and motives to encourage others to perform violent acts for the benefit of some tokens. After this was recognised was he able to breach out of the walls and run out to the outlands, that is when he found himself in rp_chernarus.
His time in Chernarus started low, he did not know where he was as he was unfamiliar to the surroundings. There was no one overseeing him and he would immidetly feel instant freedom. But this came with a cost as no one protected him and he was out of place, not following the norms of the wastes.
Donald Reagan was the misfit puzzle piece to the end of this story.