Banana Boxers are enemies that explorers will face in Deep Explorers. When you first enter the room, the banana boxer will be standing still and punching at nothing. That is how it will go for the rest of the time you are in that room. If you hit a banana boxer from the front, it will punch and kill you. If you hit it from any other side, you will kill it.
The banana boxer is unlocked from the start of the game.