Night Ranger - Chapter 96: Shadow Doppelganger

Traversing into a Fantasy World, Watson became the youngest son of a run-down baron, ranked eight in the family.

In a world where human and monsters relied on mystical fruits and their inner power to fight for dominance, a lost soul was thrown, given the powers from all the other worlds he’s known. But there was a catch; he had no control over what power he would get! With knowledge beyond that of most, he sails his path to the top of the one piece world!

- Description from Novelupdates

“Ride this, my beloved consort!” Instantly rewarded with a punch in his charming face. He looked hurt, “I just wanted you to try out the mythical beast mount!”

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.