Your costume suggestion
You're a plumber. Your work uniform consists of a long-sleeve red shirt under blue dungarees. Finish with red cap, heavy brown boots and, of course, moustache. A wrench may also come in handy.
Originally from Sweden, your Swedtalian accent is a majesty to behold. Your parents - one a plumber, one a racing driver - imbued you with all the skills you’d need in later life. You’ve tried your hand at all sorts of careers, but now you help your brother Luigi fix up his mansion. This has given you an interest in ghosts and the afterlife.
INTRODUCE YOURSELF AT THE START OF THE GAME BY READING THIS
It's a-me, Mario! I’m the Super at Bella Morte's which means I do the plumbing. Leftie loosie, righty tightie - or is it leftie locky, righty unblocky? Mamma mia! I been in the kitchen most of the night, trying to stamp out a mushroom infestation, but I never saw nobody else. I hit my head on the cupboard door and knocked myself out. It’s-a bad news about Mr Ickbread. You never know when it’s gonna be game over.