History Main / ReallyWasBornYesterday

* Mollymauk from ''WebVideo/CriticalRole'' eventually confesses to the Mighty Nein that he woke up BuriedAlive with total amnesia one day, and while he has the body and disposition of an adult, he is really only two years old. Molly is on the more functional side of this trope, but the fact that he's new to everything means he's a massive [[TheHedonist hedonist]] with a fascination for new experiences, and strangely naive about a lot of aspects of the world.

* Rocky from ''The Rocky Horror Picture Show: "I'm just seven hours old..."

Contrast ReallySevenHundredYearsOld, compare EmergentHuman, BecomeARealBoy. They're often prone to BluntMetaphorsTrauma as well. Can be coupled with ArtificialHuman if they were recently created. The extreme end of YoungerThanTheyLook. Pairs well with BornAsAnAdult.

* In ''Literature/Overlord2010'', all of the Nazarick denizens started out as simple video game NPC creations of Satoru's guild. Their existences as sentient living beings only started when they ended up in the New World alongside Satoru in his Momonga avatar. The contrast between their apparent ages and their actual ages is made clear in the Light Novel when it's noted that Sebas Tian, despite looking like an elderly gentleman and acting like one, is much younger than Climb. This also applies to the Goblins summoned by Enri using the Horns of the Goblin General. The Goblins look and act like seasoned veteran warriors, but they didn't exist prior to being summoned. The Horns actually created Goblins based on the "ideal" of what a Goblin is in the New World.

%%%* ''WesternAnimation/FrostyTheSnowman''
%%%* ''ComicBook/TheSnowman''

* ''[[VideoGame/NintendoWars Advance Wars: Days of Ruin]]'' gives us [[spoiler:Isabelle, a very recently created clone who is believed to be suffering from amnesia when in reality she's never had any memories to begin with]].
* All of the [[ArtificialHuman Murakumo Units]] ''VideoGame/BlazBlue'', to varying degrees.
** Lambda-11 is of unknown age, but dormant until Kokonoe activated her during ''Continuum Shift''. She awkwardly bonds with an insect in her story mode, but otherwise acts almost completely mechanical and obedient.
** Mu-12 ([[spoiler:Noel Vermillion]]) has been active only 5 years at the start of ''Calamity Trigger''. It's unknown how much of this effect and her lack of memories contribute to her painfully shy personality, but she is still the most social of the Murakumo units.

* Mileena in ''Franchise/MortalKombat'', didn't qualify for this Trope for most of the franchise, which claimed she grew up with her “sister” Kitana, and was thus several centuries old. However, in ''VideoGame/MortalKombat9'', the RetCon changes this so that Kitana meets her in the Flesh Pits right after she was “born”, meaning Mileena is more-or-less an infant (although "born" fully grown) as far as her true age is concerned.

* ''[[VideoGame/AdvanceWars Advance Wars: Days Of Ruin]]'' gives us [[spoiler:Isabelle, a very recently created clone who is believed to be suffering from amnesia when in reality she's never had any memories to begin with.]]

* Yuki of ''LightNovel/HaruhiSuzumiya'' appears to be a high-schooler but is really a three-year-old [[HumanAliens alien interface thingy]]. [[spoiler:Asakura]] is similar. They fit the trope even more closely later in the series, when Kyon and Mikuru meet them three years in the past and they ''still'' appear to be high-school age. And since the event that was the reason Yuki [[spoiler:and Asakura]] were created (something about data created by Haruhi and the potential for evolution) happened on Tanabata three years ago, and Kyon and Mikuru went back to that same day, it's probable that they were only a few hours old or even less at that point.

* In ''LightNovel/{{Overlord}}'', all of the Nazarick denizens started out as simple video game NPC creations of Satoru's guild. Their existences as sentient living beings only started when they ended up in the New World alongside Satoru in his Momonga avatar. The contrast between their apparent ages and their actual ages is made clear in the Light Novel when it's noted that Sebas Tian, despite looking like an elderly gentleman and acting like one, is much younger than Climb. This also applies to the Goblins summoned by Enri using the Horns of the Goblin General. The Goblins look and act like seasoned veteran warriors, but they didn't exist prior to being summoned. The Horns actually created Goblins based on the "ideal" of what a Goblin is in the New World.

* In ''VideoGame/DevilMayCry5'', V introduces himself to Dante saying "I have no name. I am but two days old… Just kidding. You can call me V." [[spoiler: He is only kidding about his name. At the time, he was ''literally'' two days old.]]

%%%* Rocky from ''The Rocky Horror Picture Show

Contrast ReallySevenHundredYearsOld, compare EmergentHuman, PinocchioSyndrome. They're often prone to BluntMetaphorsTrauma as well. Can be coupled with ArtificialHuman if they were recently created. The extreme end of YoungerThanTheyLook. Pairs well with BornAsAnAdult.

* In ''LightNovel/{{Overlord}}'', all of the Nazarick denizens started out as simple videogame NPC creations of Satoru's guild. Their existences as sentient living beings only started when they ended up in the New World alongside Satoru in his Momonga avatar. The contrast between their apparent ages and their actual ages is made clear in the Light Novel when it's noted that Sebas Tian, despite looking like an elderly gentleman and acting like one, is much younger than Climb. This also applies to the Goblins summoned by Enri using the Horns of the Goblin General. The Goblins look and act like seasoned veteran warriors, but they didn't exist prior to being summoned. The Horns actually created Goblins based on the "ideal" of what a Goblin is in the New World.

* Mileena in ''Franchise/MortalKombat'', didn't qualify for this Trope for most of the franchise, which claimed she grew up with her “sister” Kitana, and was thus several centuries old. However, in ''Mortal Kombat 9'', the RetCon changes this so that Kitana meets her in the Flesh Pits right after she was “born”, meaning Mileena is more-or-less an infant (although "born" fully grown) as far as her true age is concerned.

* In the game's first hours, Roxas is a "newborn" so to speak in ''VideoGame/KingdomHearts358DaysOver2''. He barely knows any words, doesn't know what friendship means and he is clueless about just everything. Later on, he develops more and grows a spine, gradually becoming the way he was in Kingdom Hearts II. it's justified because [[spoiler: he is Sora's Nobody and born without any of his original self's memories]].

* Grunt from ''VideoGame/MassEffect2'' is a [[DesignerBabies Designer Baby]] SuperSoldier and the only one of thousands that his Krogan creator Okeer thought was worthy, and he's basically born in your cargo bay when you release him from his tank. He does come with some NeuralImplanting, but you're the first person he actually talks to outside of Okeer talking to him while he was in his tank (when he was unable to respond). He was also deliberately designed to have his armored headplates not be fully fused together, unlike the adult Krogan, which is reminiscent of how the pieces of a human newborn's skull aren't fully fused until some time after birth.

* A common occurrence in ''TabletopGame/{{In Nomine}}'', where the angel or demon who was first sent to Earth this morning will nonetheless usually be wearing a body that looks like an adult human. Although they aren't usually sent to Earth immediately after their creation, still there's a major learning curve for those new to Earth no matter how old they actually are, and it has much the same effect.

* [[spoiler: Tailgate]], in ''ComicBook/TheTransformersMoreThanMeetsTheEye'' ends up being this: when we meet him, he's been in a form of stasis for six million years, long enough to be a peer of [[ReallySevenHundredYearsOld Cyclonus,]] which should make him one of the oldest members of the cast. [[spoiler: However, at one point, he reveals that he was created at Rivets Field. Cyclonus is surprised at this, pointing out that Rivets Field didn't fire up until shortly before the incident that placed him in stasis. Tailgate only confirms it: his body may have lasted eons, but his mind at the start of the series is only two weeks old.]]

** Ultron himself serves as an example; though unlike [[spoiler:the Vision, who's described as naïve]], Ultron's lack of life experience, combined with a quick internet download, [[spoiler:drives him insane and convinces him that [[OmnicidalManiac Humanity needs to be culled.]]]]
** Invoked when Ultron [[spoiler:accuses the Vision of naïveté.]]
--->[[spoiler:'''The Vision]]:''' Well, I ''was'' born yesterday.

* ''WesternAnimation/YoungJustice'': Superboy. Not quite "yesterday", but he's [[ArcNumber 16 weeks old]] in the first episode.