History Characters / FateGrandOrderOberon

* WeaksauceWeakness: He can't fly unassisted, just hitch a ride with one of his insects, and only when he is in his SuperDeformed mode at that. While the majority of Servants can't fly either, his Abyssal Worm's power is sucking things into a BottomlessPit; if his Spirit Origin is damaged to the point he cannot shrink, then he is doomed once he falls into his Abyssal Worm. This is exactly how he is defeated at the end; while the preceding boss fight against Cernunnos was a dramatic, uphill battle where Chaldea had to fight tooth and nail just to survive, Vortigern's defeat comes off as comically anticlimatic to the point Chaldea don't even bother killing him; Mash and Altria Avalon simply inflict critical damage on his Saint Graph and then shove him off the edge of the ''Storm Border'' before gravity does the rest.

[[caption-width-right:350:[[labelnote:Costume 2]]\\

* BreakingOldTrends: ''Servant Summer Festival 2023'' marks the first time a male Servant has more than 1 playable Summer Spiritron Dress; after clearing the event's main story a second Summer Spiritron dress for Vortigern named "Grumpy Summer Oberon" will be made available in the event shop.

* BreakingOldTrends: ''Servant Summer Festival'' marks the first time a male Servant has more than 1 playable Summer Spiritron Dress.

* LazyBum: As a playable Servant no longer beholden to his role as Faerie Britain's destroyer, Vortigern comes off as a harmless grump and spends more time lazing about and snacking than doing anything villainous. He's so lazy, he doesn't even ''bother'' cleaning his room, and only goes out 'begrudgingly' when he's needed for work.

* LateArrivalSpoiler: Despite his WalkingSpoiler status which hides his 3rd and Final Ascension appearances for players who have yet to clear Lostbelt 6, the "One Night's Dream" Craft Essence distributed during the Chaldea Boys 2022 event (which requires a simple Fuyuki clear) outright portrays him as Vortigern. Vortigern also shows up later on during ''Servant Summer Festival 2023'' complete with his own summer outfit despite the event being available upon clearing just Fuyuki.

* LateArrivalSpoiler: Despite his WalkingSpoiler status which hides his 3rd and Final Ascension appearances for players who have yet to clear Lostbelt 6, the "One Night's Dream" Craft Essence distributed during the Chaldea Boys 2022 event (which requires a simple Fuyuki clear) outright portrays him as Vortigern.

* UnplannedCrossdressing: Apparently Oberon's summer wear actually belonged to Altria Caster and he nicked it in the cafeteria, which meant that in the 1st 5 chapters of ''Servant Summer Festival! 2023'', he was actually crossdressing.

** He's the one who teaches Altria Caster magic and not Merlin (he merely introduced himself as Merlin, and because it was through telepathy, Altria didn't know his face) because one day Altria mentions she wishes she could make fire as the stable she's staying in is very cold. Despite being actually incapable of using magic, he goes through the pain of learning it in order to teach Altria how to do it, and this goes on for about a year; Altria will mention what she wants to learn, and Oberon Vortigern will learn it for a few days before teaching it back to her. This is why the majority of Altria's magic is rather unique and oddly specific.

He debuts in "Lostbelt No. 6: Fairy Round Table Domain, Avalon le Fae", serving as an ally for the first 2 parts and eventually the true antagonist and FinalBoss in the Collapse Arc as he is the one behind the threat of the planet collapsing that forced Chaldea to enter the Lostbelt. His playable version was eventually released as a Limited Servant during the Lostbelt 6 Conclusion Campaign, getting the honor of being the 1st Pretender in the game and the franchise as a whole in the process. He also shows up in the "Mystic Eyes Symphony ~Enchanting Forest and Lovely Footprints~" event... for a short while before heading back to the control room.

[[caption-width-right:350:[[labelnote:Summer Costume]]\\

* LateArrivalSpoiler: Despite his WalkingSpoiler status which hides his 3rd and Final Ascension appearances for players who have yet to clear Lostbelt 6, the "One Night's Dream" Craft Essence distributed during the Chaldea Boys 2022 event (which requires a simple Fuyuki clear) outright portrays him as Vortigern.

** In his own Valentine's scene, if you choose to see him alone, he wonders how you found him and as you mention "Merlin Magecraft", he sounds annoyed, referring to Altria Caster and denoting "Who taught you that scam magecraft". Given he called himself "Merlin" when telepathically speaking to her and being responsible for teaching her Magecraft, he's naturally taught Altria Caster that magecraft and is annoyed that it's used against him. You can even rub it in his face by offering to show him a hand mirror.

* IdiotHair: When SuperDeformed, Oberon gets this to emphasize this form's ditzy nature. Combined with BlushStickers, this makes him extremely cute (and appropriately is made as a plushie as real-life merchandise).

* NoSell: A Midsummer Night's Dream EX gives him immunity to Mental Debuffs and Curse. Despite this, he's not immune to his own Ending of Dreams either, leading to various HoistByHisOwnPetard moments in battle.

* {{Leitmotif}}: Once Oberon shows his real self and is fought as the final boss of the Lostbelt 6, it is appropriately titled [[https://youtu.be/xrM-KutDyTM "The End"]]. A snippet of the song also plays whenever he uses his Noble Phantasm in his Third Ascension, transforming into the Abyssal Worm itself.

* VillainBall: After Excalibur was forged during the Sixth Lostbelt, Faerie Britain was destined to fade away peacefully regardless of what anyone did due to the core of its Singularity being corrected, but Oberon decided to expedite its erasure anyway by calling upon the Abyssal Worm instead of sneaking away into Proper Human History to unleash it there like he also wanted.

* NearVillainVictory: Once he becomes the Abyssal Worm, he comes damn near destroying the entire planet before Chaldea stops him. According to Sion he was only ''two minutes'' away from complete victory. Even outside of that, he had everyone but the Protagonist put to sleep within the Abyssal Worm, and outside of Albion's influence, the only other person able to face him was the Protagonist. If not for Caster Altria returning as Altria Avalon, he'd have killed Chaldea as a faction.

* LovingAShadow: For Oberon, Titania isn't "Oberon's wife" so much as "a person who can accept Oberon for all his flaws." However, even if he should meet someone who did match his criteria he would refuse that he finally found his shining star.

* NearVillainVictory: Once he becomes the Abyssal Worm, he comes damn near destroying the entire planet before Chaldea stops him. According to Sion he was only ''two minutes'' away from complete victory.

* PerceptionFilter: It’s later revealed that throughout your journey through Faerie Britain, Merlin is unaware that Oberon even exists since he cannot even ''see him'', making him think that you've been talking to yourself the entire time. His profile reveals this to be part of his skill, Anti-Human Order (D Rank), which allows him to interfere with phenomena and laws within humanity. Oberon dislikes Merlin in particular, so much to the point he allocated all camouflage abilities given by this skill towards keeping Merlin from seeing him. This ability to conceal himself from observers, even high level Clairvoyance on Merlin’s level, as well as how Chaldea’s sensors pick up his Abyssal Worm form as “a hole in reality”, gives him an uncanny similarity with [[EnigmaticMinion the Priestess of the Foreign God]].

* {{Bishonen}}: Despite being unrelated to the Pendragons unlike his AlternateSelf, this Vortigern still has natural good looks. This is actually what caused the Welsh fairies to accidentally brainwash him, as he was so pretty that they were convinced he had to be a prince of some sort, thrusting the identity of Oberon on him.

** When talking on Barghest, he does mention that even he thinks he did her dirty by staving off her transformation as a Calamity and making her think her lover was alive, stating she reaped what she sewed and there was no helping her. However, she did also burn down the Autumn Forest and kill all the insect faeries who relied on him, so [[KickTheSonOfABitch he might be rightly angry about that.]]

---> ''"I really didn't have a reason. I was just having a bad day"''.

* ItsPersonal: Zigzagged regarding his relationship with Morgan. Ever since his first incarnation as King of the Mors, Vortigern did everything he could to kill her and undo everything she had ever done by destroying Faerie Britain, and there is no denying he has a degree of hatred toward her, which is mutual on Morgan's part. However, upon his Third Ascension, he claims the reason he didn't watch Morgan's death in the Lostbelt is because he acknowledges he was only born as a response to Morgan's actions in preserving Faerie Britain, and he doesn't hate "the picture book she drew" - as in, he doesn't hate the story she has created.

* RageAgainstTheAuthor: Oberon definitely has a problem or two with Shakespeare. His My Room line for him has him writing a heartfelt letter to "his author", only to tell you to deliver the letter to "that bastard" and warning you that the wax seal and the ink he used are filled with poison.

** In the beginning of part 2 of Lostbelt No. 6, Goredolf mentions how Morgan le Fay of Proper Human History was actually the second fairy embodiment of Britain after her uncle Vortigern. Murian commented earlier that Oberon does not resemble any fairy in the Lostbelt, hinting by fairy standards that he's extremely unusual.

* TakingTheBullet: He does this in the climax of Lostbelt No. 6 Part 2 for the heroes (specifically Altria Caster) when Morgan's extra clones attack them after they've let their guards down thinking they've won from beating the first one. He pretends it killed him so he can make his moves in the background of Part 3.

** The third part of Avalon le Fae reveals ''many'' things regarding his true identity, the least of which includes the fact that he's actually in a completely new Servant Class for the game and that he's actually a completely different character under the belief he is Oberon. It's to the point where players who haven't completed Avalon le Fae and his interlude but were able to summon him cannot view his last two ascension arts.