Miner

How to unlock: The Miner is found in the Magma Caverns, Stage 4. He has a chance to spawn at the right of the map, at the end of a lava tunnel. After reaching his area, a miniboss Elder Lazurian will spawn. Defeating the Lazurian will unlock the Miner.

The Miner has short range but many dashes. In order to survive, you will have to balance both dashes and your extra jump to avoid enemy fire. Remember that Crush does alot of damage!