Blaster Master Zero has been a critical success on the Nintendo Switch and Inti Creates released their first DLC last week – Gunvolt from Azure Striker Gunvolt. Next week, May 17th, the DLC begins to cost $1.99, but for now you can download it for free!
In fact, you do not even need to own the game in order to download this free character. All you have to do is go to the Blaster Master Zero product page in the Nintendo Switch eShop, click on the DLC, and click purchase and it will register your purchase. If you do this in the next week, you will have Gunvolt waiting for you when you inevitably purchase the game, and you should get on purchasing it sooner rather than later.