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1->He killed them all...she lost to a maniac...both are poor lost souls. Fortunately, the Continuum Shift seems to think them still useful. Given a second chance in a new world, the two will aid in a rebellion against a tyrannical dictator and return the throne to its rightful heirs.
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3''[[https://www.fanfiction.net/s/8469346/1/Omniverse-Underground Omniverse Underground]]'' is a crossover between ''WesternAnimation/Ben10'', ''WesternAnimation/SonicUnderground'' and ''Franchise/BlazBlue'' written by [[https://www.fanfiction.net/u/961900/GammaTron Gammatron]] and [[https://www.fanfiction.net/u/2327307/Seanzilla1988 Seanzilla1988]] in which Ben Tennyson and Makoto Nanaya somehow end up on Mobius after unknown series of events and a near fatal encounter with Hazama respectively. The two quickly join the royal siblings in their war against Robotnik, and try to figure out how they ended up there in the first place.
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5Similarly to the authors' [[Fanfic/GalacticShiftExtend other works]], elements of other series are also introduced as the story goes along, as well as other continuities for the Sonic side of things.
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7!''Omniverse Underground'' provides examples of:
8* AdaptationalAngstUpgrade: It's not clear what happened to Ben before he arrived on Mobius beyond the fact that he did not go through the events of ''WesternAnimation/Ben10UltimateAlien'', however it's heavily implied that the Forever Knights were significantly more ruthless and went after his family. Later chapters imply that he went [[HeWhoFightsMonsters just as dark in stopping them]], and holds significant guilt in the present.
9* AdaptationalIntelligence:
10** Dingo has become ''significantly'' more intelligent in this version, going from a DumbMuscle to a competent tracker, and is mentioned to have successfully caught several Freedom Fighter groups.
11** Ben is noticeably more mature and tactical here, being more tactical with what forms he uses rather than favoring his heavy hitters. He also makes frequent use of Gray Matter between missions to work on the groups gear and dedicates time to pondering any ongoing mysteries when in the form, showing off his SuperIntelligence more. [[ArsonMurderAndJaywalking And he apparently learned Japanese from his mom's side of the family]].
12* AdaptationOriginConnection:
13** Rachel Alucard mentions that the Oracle of Delphius was one of her magic instructors before the story began.
14** It's revealed that this Ben has actually met Ragna before during a previous summer (in addition to Jubei, Rachel and Valkenhayn), and outright admits he sees him as an older brother. In the flashback, Max has apparently helped out Rachel and Jubei before, suggesting he's been to the Blazblue timeline.
15* AbdaptationalVillainy: Jin Kisaragi, slaughtering [[spoiler: Roll's family]] just necause he considered them freaks and mutated Beastkin.
16* AlmightyMom: [[spoiler:Makaya Nanaya]] is clearly this, being able to keep her super strong husband and daughter in line.
17* ArmorPiercingQuestion: When discussing Ragna's status as TheDreaded in her world, Makoto tells Ben that he destroyed three NOL bases. She visibly pauses after Ben asks her how many casualties he caused, admitting that there were none.
18* TheBerserker: Ben as [[VideoGame/TransformersWarForCybertron Grimlock]].
19* BeyondTheImpossible: Ben mentions the one time he tried to forcibly wake up Ragna when his friend was exhausted, he felt the resulting punch for weeks afterwards. Despite being ''Ghostfreak'' when he tried.
20* BigBrotherInstinct:
21** Ragna has this to Ben, seeing him as an honorary brother and threatening [[spoiler:Rook]] when the latter states he intends to arrest him. When the two reunite, he's consistently one of the few people able to get him to open up about his past trauma, and even gives him advice on how to deal with it.
22** According to Alpha, Ragna extends this to [[ShrinkingViolet Noel and Haseo]], being very protective of both of them.
23* BrokenAce: Ben, being an experienced superhero with access to [[SuperPowerLottery virtually every powerset imaginable]], and is even ''more'' resourceful and intelligent than his canon counterpart, even acting as TheSmartGuy for the heroes. He's also harboring immense trauma prior to being put in stasis, and reacts poorly to any triggers.
24* CrazyPrepared: The rules for the Hyorinmaru clan engagement state that the bride to be must remain within a certain distance of their partner, and includes several additions for when it still applies, up to ''other dimensions''.
25* CurbStompBattle: Ben delivers one to Sleet, Dingo and their forces thanks to turning into [[AttackOfTheFiftyFootWhatever Way Big]].
26* CuteClumsyGirl: The Yayoi's family maid Hina, near constantly tripping on her own feet and losing her glasses.
27* DoubleStandardAbuseFemaleOnMale: The Hyorinmaru tribes law on their RescueRomance can apply regardless of the gender of the rescuer, but states that it does not apply if the rescuer intentionally set up the situation, and that the woman in question will be compensated in such an event. However, Miyuki only specifies the punishment for men that do this (banishment and castration), with no mention of what happens to women who attempt it.
28* EpicFail: Apparently, while driving the RV, Manic has managed to crash it into a ''mirage'' of a tree.
29* EvenEvilHasStandards: Sleet is an utter scumbag willingly aiding in Robotniks hold on Mobius and throughout their 'partnership' shows the absolute minimum concern for Dingo's wellbeing. Nevertheless [[spoiler:he is genuinely saddened when his friend 'dies', and is outraged when Shockwave bluntly suggest he get over it]].
30* {{Expy}}: Jake, J, and Jacky (a trio of Mobian raccoons) are ones for [[WesternAnimation/EdEddNEddy Ed, Edd and Eddy]] respectively, being a CloudCuckooLander, TheSmartGuy, and a greedy, wannabe ConMan respectively. They also have their own equivalent of the [[AbhorrentAdmirer Kanker sisters]].
31* FantasticRacism: Ben and Makoto are forced to be discrete in several parts of Mobius, owing to Robotnik giving humans a bad name.
32* {{Foreshadowing}}: In the opening chapter, Kokonoe remarks to Sonic that he and his siblings are only using about 20% of their medallions true power. [[spoiler:Much later, it turns out all three can [[MorphWeapon turn into melee weapons]], Sonic's a sword, Sonia's a spear and Manic's a knife or armour.]]
33* LetsYouAndHimFight: Makoto initially fights Ben, owing to just coming out of a brutal fight with Hazama, and seeing a green colour scheme on him.
34* LikeFatherLikeSon: ''Celebrations III'' shows where several of the Remix Heart members pick up their quirks from.
35** Noel and her mother have a shared love of soaps, and get [[TranquilFury upset]] if anyone talks badly about them.
36** Makoto shares her fathers boisterous attitude and BigEater tendencies.
37** Tsubaki and her father both enjoy classical literature, while she and her mother have [[BewareTheNiceOnes a scary fixation on 'justice' when enraged]].
38* MorphWeapon:
39** The siblings medallions can turn into instrument/laser rifle hybrids, as per canon. [[spoiler:Sonic later discovers his can turn into a sword and gauntlet based off [[VideoGame/SonicAndTheBlackKnight Caliburn]], and as the story progresses it's revealed Manic's can turn into a dagger and armour, while Sonia's turns into a spear and armored shoes. All three can further combine with one another when Sonic wields them, creating Excalibur Sonic.]]
40** Roll has a sword (and previously a pocketknife) that can change form by absorbing her Wisp companion, Yacker, depending on what form he takes.
41* MundaneSolution: After capturing Ben, Robotniks forces prevent him from using the Omnitrix by... putting a clamp over it.
42* NoodleIncident:
43** In a flashback, Jubei mentions a few involving Ragna, including one time where his apprentice nearly got the Beastkin sold to a circus. Ragna says he's still sorry about that one.
44** Likewise, Ragna and Ben apparently had several in the summer they travelled together, at one point ending up in an alternate Australia that was [[DeathWorld full of things that tried to kill them]] like exploding trees and kangaroos with metal teeth.
45* RescueRomance: After Sonic rescues Roll, she kisses him and declares them engaged. It later turns out this is a practice amongst the Hyorinmaru tribe, with women marrying whoever rescues them from mortal peril (though it doesn't count if someone causes said danger in the first place). The triplets father Azure ended up meeting Aleena the same way.
46* ShipperOnDeck: Queen Aleena officially approves of Roll and Sonics relationship, even saying she's welcome as part of the family.
47* ShipSinking: Noel firmly tells her parents that she sees Ragna as an older brother, a sentiment he reciprocates.
48* ShipTease: Several couples are teased throughout the story.
49** As with most of the co-authors works, Ben/Makoto.
50** Sonic with his RescueRomance fiance Roll.
51** Surprisingly, [[InterspeciesRomance Manic and Tsubaki]].
52* ShoutOut:
53** Alpha's powers come from nanites letting him build various machines, just like the main character of ''WesternAnimation/GeneratorRex''.
54** When traveling to Sin Alley, the main character run into ''Franchise/SamAndMax''.
55** Several of Robotniks [=SWATBots=] have rather familiar names, including [[Franchise/{{Transformers}} Starscream, Shockwave, Jetfire and Jetstorm]].
56** When the main characters visit the Oracle, he gets the group to find a spell that is [[WesternAnimation/{{Chaotic}} a cross between music and magic]].
57** Noel's parents are named [[Literature/TheGreatGatsby Daisy and Gatsy]].
58* TrademarkFavouriteFood: On top of canon examples like Bens love of smoothies, Sonics chili dogs, and Makoto for anything acorn flavoured, Manic is just as obsessed with pancakes as his brother is with chili dogs.

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