History Main / SiblingFusion

[[caption-width-right:350:Now, ''that's'' brotherly bonding]]

* ''Literature/CallahansCrosstimeSaloon'': The MacDonald brothers end up doing a mental version of this in their debut story, they're essentially one personality in two separate bodies but they didn't start that way. Interesting they're just telepathic brothers, not twins.

** ''Anime/DragonBallZTheTreeOfMight'': Among Turles's minions are the twins Lakasei and Rasin who can merge into a single being and separate at will.

** ''Anime/DragonBallSuper'': During the Tournament of Power arc, Shin proposes the idea of Androids 17 and 18 fuse together using the Potara Earrings. Beerus acknowledges they would be quite compatible since they are twins and the resulting fusion would be very powerful. However, the idea was tossed aside after Whis explained that if the fused fighter were dropped out it'd count as both fighters being dropped out and would result in two losses for their universe.

* ''Anime/DragonBallZTheTreeOfMight'': Among Turles's minions are the twins Lakasei and Rasin who can merge into a single being and separate at will.

* ''ComicBook/MalibuComicsMortalKombat'': {{Canon Foreigner}}s Sing and Sang (pictured above) are a pair of twins who can merge into the being Siang. Individually, they possess exceptional skill but when merged together their abilities double. [[spoiler:Unfortunately, they were no match for Goro, who forced them to defuse, killing Sang in the process]].

* ''Literature/ThiefOfTime'': Happens to Lobsang Ludd and Jeremy Clockson at the climax of the book so they can fix the damage caused by the Glass Clock breaking. It's not too surprising considering it's also revealed that they were originally one being, but got separated when their mother, the AnthropomorphicPersonification of Time, experienced a difficulty during childbirth.

* ''VideoGame/VoltageFighterGowcaizer'': Twins Ryo and Suzu Asahina fuse together in their Kaizer Form to create the sub-boss Platonic Twins where Ryo becomes the arms, shoulders, legs, and head or Suzu is suspended in the centre as a torso and arms. Despite the boss name having "Platonic" in there [[BrotherSisterIncest is also a case]] of RomanticFusion at least according to the OriginalVideoAnimation adapation.

* In the climax of ''Literature/TheBadPlace'', Frank finally kills Candy by teleporting them both all over until they are both [[TeleFrag Tele-Fragged]] to death into a BodyHorror mishmash.

* ''WesternAnimation/ThePowerpuffGirls2016'': In the last part of the "[[Recap/ThePowerpuffGirls2016S02E23PowerofFour Power of Four]]" episode series, Bliss, Blossom, Bubbles and Buttercup join together into a construct of a bigger Powerpuff Girl to fight HIM in the final battle.

* ''VideoGame/VoltageFighterGowcaizer'': Twins Ryo and Suzu Asahina fuse together in their Kaizer Form to create the sub-boss Platonic Twins where Ryo becomes the arms, shoulders, legs, and head or Suzu is suspended in the centre as a torso and arms. Despite the boss name having "Platonic" in there [[BrotherSisterIncest is also a case]] of RomanticFusion.

** Chapter 2 of the Reverse novels (episodes 33-34 of the anime) has a witch akuma who is actually a pair twin sisters souls fused together. The back story is that the ill twin sister was forced to become the town's witch after the previous one died while the healthier twin left town in order to learn medicine so that she could help her ill sister. When the healthy twin returns, she finds out her sister has died and begs the Millennium Earl to bring her back to life which he does and the healthier twin fuses with her sister resulting in one akuma made up of two people. The sisters then vow revenge on the village for mistreatment to the ill twin. This is rather notable as every other akuma kills the person who brings them back and wears their flesh as their human disguise making the twins a rare exception to the rule.

* ''ComicBook/MalibuComicsMortalKombat'': {{Canon Foreigner}}s Sing and Sang (pictured above) are a pair of twins who can merge into the being Siang. Individually, they possess exceptional skill but when merged together their abilities double. [[spoiler:Unfortunately, they were no match for Goro, who forced them to defuse, killing Sang in the process]].

* In Russia, a few plant species which produce different-colored flowers on the same plant are collectively known as John-and-Mary (????-??-?????). The legend behind the name is that two siblings by these names were separated during a Mongol raid and made slaves. After growing up, they met, fell in love and married, but then [[SurpriseIncest the relationship was revealed]], and they desperately prayed to God that he would allow them to remain together '''somehow'''. Hence the flowers.

** Starting from ''Film/UltramanRBTheMovieSelectTheCrystalOfBond'', Rosso and Blue can also fuse with Ultrawoman Grigio, who is the Ultrawoman form of the sister of their human hosts, into Ultraman Groob to defeat even stronger opponents.

* In ''[[VideoGame/InazumaEleven Inazuma Eleven Go Chrono Stone]]'', Tsurugi Yuuichi's alternate timeline self fuses his aura with that of his younger brother Kyousuke. This allows them to defeat Protocol Omega.

* ''ComicBook/MalibuComicsMortalKombat'': {{Canon Foreigner}}s Sing and Sang (the page image) are a pair of twins who can merge into the being Siang. Individually, they possess exceptional skill but when merged together their abilities double. [[spoiler:Unfortunately, they were no match for Goro who forced them to defuse, killing Sang in the process]].

* ''WesternAnimation/TransformersAnimated'': Jetfire and Jetstorm are two Autobot brothers who can combine into a gestalt named Safeguard.

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* ''ComicBook/MalibuComicsMortalKombat'': {{Canon Foreigner}}s Sing and Sang are a pair of twins who can merge into the being Siang. Individually, they possess exceptional skill but when merged together their abilities double. [[spoiler:Unfortunately, they were no match for Goro who forced them to defuse, killing Sang in the process]].