The Doppelganger

After killing Richard's son, Rodney, the doppelganger assumed his appearance and gained his memories. Over a decade later, he came across The Prince and became something similar to his executioner, at least at the beginning.

Actually, he enjoyed killing so much that he and The Demon colluded behind The Prince's back to kill many others that The Prince was unaware of.

However, there was a mutual distrust and disdain between him and The Necromancer.

He was later killed by the group of paladins including Ferdinand, Gerald, Joe, Luc, Lily, Marco and Alex, and absorbed slightly after by Gerald.

Personality
The Doppelganger was a killer, and enjoyed it that way. He like seeing the desperation and pain in others, and drawing it out of them.

There was, however, a single knot in his heart: Richard. Upon killing Rodney, he gained all his memories, including Rodney's love for Richard. He felt it was holding him back from truly being the killer he could be, and for years trained so as to be able to kill Richard himself and rid himself of the emotions. Eventually he did, but he only grew angrier upon realising that nothing had changed at all.

Powers
The doppelganger was extremely capable with a spear, and was able to materialise his killing intent onto his armour and weapon, forming a hard and easily repairable protective layer, which also happened to protect him from Gerald's absorb skill in their first encounter.

His killing intent also naturally caused great fear in his enemies, especially if they were weaker or perceived themselves as weaker than him, making them unable to exert their full strength.

Fast on his feet and capable of exerting considerable strength, The Doppelganger was a difficult foe to face.