“Blazes are mobs with a yellow skin and black eyes found in The Nether. They primarily spawn from Monster Spawners found mostly inside Nether Fortresses. Their bodies are made up of a head atop a central column of smoke, and three rotating sections. Each rotating section contains four floating yellow rods. Blazes can fly and shoot Fire Charges. They make a metallic breathing sound.”
Blazes only spawn from Spawners inside Nether Fortresses.
Blazes will start shooting Fire Charges when they see a player. They will shoot a 3 round burst of fireballs, and there is a cool down period between these attacks. They are immune to fire and lava. Keep in mind that Blazes can also use a Nether Portal and therefore go to the Overworld.
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