Adventure Hero

Your story is really cool. I just finished reading it, but I wanted to give a warning: don't include a harem. Many stories start that way, but with third-party influence, it ends up becoming a harem, which ruins many good stories. So I wanted to give you a warning before you start this story completely.

Wasn't there a similar story, but with a main character who was an earth pony that could transform into a unicorn and a Pegasus?