A Fairytale for the Demon Lord

A Fairytale for the Demon Lord is a Korean Manhwa Web Comic about a knight who rescues a princess from the wicked demon lord who has kidnapped her.

Sort of. Black and Gray Morality (perhaps even Black And Black Morality) abound.

The scanlations of this webcomic are usually updated weekly and can be read here. For those who want to see the original Korean version, go here.

(Be warned that spoilers abound below; the worst of them have been tagged, but it's hard to list any tropes at all for this work without spoiling some things.)

The Tropes associated with the series

 * Black and Gray Morality: Somewhere between this and flat-out Evil Versus Evil.
 * Blind Seer: Mimir.
 * Curb Stomp Battle: Just about anyone and anything who fights the Nameless Knight and who isn't clearly the Big Bad dies in one panel, but most obviously Balder. He gets a bonus chapter complaining about this (along with several other villains who were unceremoniously killed.)
 * Decoy Protagonist: The first chapter and much of the second makes it seem like the Demon Lord is going to be the main character.
 * Deliberate Injury Gambit: Of course, his insane healing abilities make this less of a sacrifice than it seems.
 * Dude Looks Like a Lady: Puginn
 * Evil Makes You Ugly
 * Evil Overlord: Of course. The demon lords seem to be an entire series of identical evil overlords, not just one.
 * Flash Back: The majority of the story is dedicated to showing how  became the Demon Lord seen in chapter 1.
 * Gainax Ending: Despite all the ridiculous plot twists that build up during the story, by the end they've mostly settled down...then the ending finally shows up, and turns the whole thing into a Mind Screw of MASSIVE proportions...again. It's such an unexpected twist that even  is taken by surprise.
 * Healing Factor: The Nameless Knight can recover from losing half his body near-instantly.
 * The Demon Lord also has an innate regeneration ability, though it's much slower.
 * Healing Hands: The princess.
 * History Repeats: Either this taken to literal extremes or a flat out Stable Time Loop; it's not yet clear which.
 * Kick the Dog: Several, but by far the most dramatic is when
 * Love Makes You Crazy and Evil:
 * Mission Control: Puginn fills this role for the protagonist, frequently.
 * Noble Demon: The demon lords are often this; one of them even goes so far as to bless Odin's efforts as he fades away after the guy kills him, even while telling him that You Can't Fight Fate.
 * Poor Communication Kills: The Nameless Knight could just
 * Protagonist Journey to Villain
 * RPG Mechanics Verse: A subtle version -- subtle enough that it's hard to be sure -- but much of the technology and many of the rules of this world seem to subtly work in ways that match those of an RPG; in a way, it's like a dark take on what world like that would really be like. Unlike most, it's not at all played for comedy.
 * Save the Princess
 * Screw Destiny: Almost every named character has this as their goal in one way or another. Several characters will flat-out flip their lid if you mention fate in front of them at all.
 * Schizo-Tech: They seem to have technology capable of instantaneous long-range teleportation and communication, materialization of objects from nowhere, and prediction of the future. Yet to fight, they rely on swords.
 * Well, since so many seem to be able to heal quickly, swords are just the easiest way to tear enemies to pieces. So there is nothing left to heal
 * Spanner in the Works: The Nameless Knight, to.
 * Tomato in the Mirror:
 * True Art Is Incomprehensible: This manhwa definitely qualifies as art, and it is quite incomprehensible.
 * Voluntary Shapeshifting: Puginn turns from a crow into a -- person.
 * You Can't Fight Fate
 * You Can't Fight Fate