[Displaced] My Name was once Jack now it's Toshiro Hitsugaya.

I was attending an anime convention with my friends when I bought a replica of Captain Hitsugaya's sword, Hyourinmaru, from a shady merchant, and was transported to Equestria before the show began and made it my duty to protect the mane six from danger without them noticing me

Set after The Flash Season 2 finale:

After being betrayed by Zoom (Jay Garrik) Flash is willing to change the past and save his mom, but the Speed Force sends him to Equestria instead so he can become the mentor of a young speedster whose powers are to be awaken.

In the meantime after spend four years trapped in a desert island, Blue Blood is willing to fix the mistakes of his past.

Edited by rich-online. Thank you for all your help budy!

I was just a normal deadbeat. I had trouble keeping a job, even through I didn't have many personal issues that would caused me such troubles, and I didn't have many friends. So, in short, there's really nothing special about me.

But that all changed when the security firm I worked for was hired for an extra muscle at a Con. I don't clearly remembered what happened next, but I awoke to find myself in a world not my own, with a body not my own, but luck was with me, as a party was going on. Unfortunately I didn't get a chance to join in as the party was rudely crushed by some uninvited guests.

Now it was up to me to save the day, learn why I'm here and why I have these new powers and body. But on the bright side, I may finally get a family I so long desired.