Hello, my name is Hit and I am a Hitman. I was known as Tim, but isn't much better than Hit. I am an assassin, though I wasn't always like this. I dressed up as Hit and went to Comic-Con, I made the mistake of purchasing Hit's Assignment Device, with it, I was sent to Equestria. After training in solitude I decided to become a Hitman, it's in my nature. One fateful day I get a mission by the Princess of the Sun, Princess Celestia Sol. Princess Celestia gives me a contract and I make the mistake of signing it. After completing the job, she forces me to learn to Magic of Friendship with Twilight Sparkle and her friends in Ponyville.

Oh boy...

Now open to crossovers.

The ultimate surprise - Fimfiction

The events take place after the Main 6 defeated Discord, while the other side, Ash has just finished his adventures in Alola. The two worlds intertwine, making the Ash Ketchum and his partner Pikachu cross paths with Twilight Sparkle and her friends.