Hi all!
Just thought I'd drop this here: https://www.fanfiction.net/s/12272288/1/The-Human-Who-Came-to-Mobius. It's rated M for swearing and for a genuinely deadly plan to depose Robotnik and Snively.
A thoughtful human student appears mysteriously (of course!) on Mobius, and with the help of the Knothole Freedom FIghters, orchestrates a plan to remove Robotnik far more deadly than anything the FFs themselves have ever devised.
Written in return for a favour by a friend, and I chose to give him a cliche entrance just so I could focus the word-count on the complexities of his plan. The story also explores the psychology of the Mobians.