Oh my, this was unexpected indeed XD Really fun though and like you said never would have thought to draw a dwarven plumber! Gives me ideas about what a game might look like with this character, fighting off broken pipes or rats and leveling up skills to go deeper in to the dark sewers.
Oh also a small tip for better visibility when posting btw! When you exporting via file>export setting it to 300-400% makes a larger image but keeps the pixel goodness as it scales everything up!
Thanks for sharing this!