https://www.royalroad.com/fiction/60292/all-the-dust-that-falls-a-roomba-isekai-adventure
Ok, this is a little odd/quirky story. A Roomba is the hero of this tale, and it's told damn well..
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Original ONGOING Adventure Comedy Fantasy
Some seek power. Some seek justice. Others seek to root out the filth lurking in the darkest of corners.
Spot was summoned from his comfortable charging pad and familiar floors to a world of magic and intrigue. After the flight of his new patrons, he is left to care for a filthy castle. During his quest to keep this new home clean, he will face demons, foreign armies, and the dreaded stairs.
All those who stand before him will be swept away. Those who follow his spotless trail will find enlightenment, purity, and a world on its knees.
Follow this wholesome vacuum on his quest to power, posting every day.
[participant in the Royal Road Writathon challenge]
--- AfterShock/Android 1.6.8
* Origin: FireCat Mobile (4:920/1.1)