This is what I planned for them in their future timeline!
Shortcut:
Supposedly, Shortcut plan to follow Error's footstep 'cause he think it's fun but that change when his glitchy "father" destroyed their timeline. Since then, he's pissed at Error for choosing a d*ck move as well as at Geno for agreeing in the first place and being of Error's is no longer something he's proud of. He and his "brother", Sage, managed to save Sans and Papyrus only(since the world is already crumbling and they only have limited time) and they took shelter in the Omega timeline. Eventually, Core!Frisk found a new home for them and Shortcut and Sage teamed up to make sure no Errors or Frisk could alter that timeline again. Shortcut self-appointed himself as the TimelineCorrecting Virus, he fixes outside glitches and prevent outsiders(specifically Error) from entering his world. During that, he meets up with Fresh. Since Shortcut was pretty young and only has few exprience, Fresh took him under his wing.
Sage:
Sage was reading a good book with his "Uncle" Papyrus when his world suddenly started to fall apart, luckily, he were able to teleport them out before they got erased too. He and his brother were reunited again in the omegatimeline as well as with his "father", Sans. There, he learned about his other father's, Geno, reckless decision and felt deep resentment for his idiocy. After finally settling into a new home world, he and Shortcut agreed to never let anything happen to their new home. Sage took residence in the Savescreen to monitor the whole place and make sure no one would hit the reset button, guarding the inside while Shortcut guards the outside.
Extinction:
Extinction was inspired to become like his father Death, so as soon as he became of age(he has been confirmed to be the eldest despite Goth was born before him but he was already existing as a SOUL before Goth was even a thought) he went as a reaper-in-training and eventually got the title "Modern Day Reaper" and he's happy at what he does. Regardless of what he morbidly loves to do, he's a nice guy. And even though skirmishes happen frequently in his family(mostly from Error and Geno), he still manage to be happy and get along with his "half" siblings. He cant really say they're half siblings since they came from the same person, just from an alternate dimension.
Phew!
Just to clear things out, Shortcut and Sage are not in-timeline brothers with Extinction. Ex came from the "With Death" timeline while the two came from the "Without Death" one, y'know, the one where RoyalAfterMath(KingErrorxKingGeno) and DesctructEon exist, also the alternate timeline where Troubleshoot(ErrorxAnti) and Trojan alternately exist.
So, in the "With Death" timeline, the only true brothers there are(chronologically arranged) Extinction, Goth, Lethal, Accident&Incident and Eon.
*All of them('cept Eon) came from the same Death
*Extinction, Accident and Incident are Error's
*Goth is Geno's
*Lethal is Fatal's
*Eon is Geno's and Error's
In the the "Without Death" one(chronologically arranged) Shortcut, Sage, Savage, DesctructEon, Oversight, Reconfigured(tho none of his parents are natives of this timeline but he's related to Oversight and Trojan)and Trojan are brothers/half-brothers.
*Shortcut, Sage and Oversight came from the same Sans
*Sage, Savage, and DesctructEon came from the same Geno
*Shortcut and DesctructEon came from the same Error
*Oversight and Reconfigured came from the same Anti_Error from a different timeline
*Trojan came from the timeline split version of Sans(who later glitched into
another Anti_Error) and Error who had Shortcut
Wow, this is confusing XD XDD
Sans (c) TobyFox
Shortcut(ClassicxError), Sage(ClassicxGeno), and Extinction(ErrorxDeath) (c) Me
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