Blaze

Blazes were introduced in the pre-release of Minecraft 1.9. They have the ability to float and shoot fireballs at the player. They appear set on fire while shooting fireballs, and then will "cool down", before repeating the process. Like Ghasts, Blazes can float.

Blazes drop Blaze rods, and can spawn both naturally, and from a spawner in the Nether.

Trivia

 * Unlike mob spawners found in the normal, world lighting the ones you find in nether up won't stop mobs from spawning from them.