User blog comment:Monk the Cat/Monk's Votes/SFW Winter Awards 2016/@comment-7637833-20160111054428

I kinda think you missed the part where Serges serves Sigma the Tyrant willfully, and actively fights the mortals and protagonists to enforce Sigma's will. He's a Noble Demon, yeah, but he still carries out his master's will with determination and strength.

And the "he agrees with Sigma about the strong crushing the weak" part? There's a sentence or two explaining in his personality: "However, he agrees in a different manner - while Σ sees it as natural selection, Serges sees it as predestination. He feels that those who have fallen were destined to fall at some point, and has no remorse nor qualms with people dying."

Plus, he serves those who are strong and powerful, or have earned his loyalty by some other means. Sigma (and later, Derek Gate) both earned his respect and loyalty, with Sigma having taken over the throne and gaining Serges as a loyal follower because of his strength and Derek reviving him into a powerful Cybermal some time after the events of Darkness Trigger: Surge of Shadows. And in the latter case, Serges swears revenge on the mortals - particularly Whirlwind and the other protagonists - for disgracing him and stripping him of his honor.

So, uh, yeah.