To your question "how is populism in Bulgaria different from populism elsewhere?", I'll answer that these 3 people are clones of 3 similar populist politicians we have in France. And similarly to yours, none of our 3 populist figures use mythological or religious ideology. Except number 1) I suppose, as he is a devout Christian. But he uses that aspect to condemn Turkish entry to Europe, not to further any other political agenda.

1. is a clone of Philippe de Villiers, an aristocrat with similar ambitions, though fortunately for us de Villiers has never led a government and probably never will.

2. is a clone of Nicolas Sarkozy, the tough and straight-talking guy with no apparent program other than being elected (which unfortunately for us he has a good chance of)

3. is a clone of Jean Marie le Pen, our homemade holocaust denier who dislikes ethnic minorites, and who made it to the 2nd round of the presidential elections in 2002 against Chirac.