History Main / CantLiveWithoutYou

* In ''VideoGame/XenobladeChronicles2,'' if a Driver dies, then all [[EmpaticWeapon Blades]] they've resonated with will return to their [[HeartDrive Core Crystals]], [[DeathOfPersonality never to remember their past lives upon reawakening ever again.]] If a Blade were to share a piece of their Core Crystal with their Driver [[spoiler: or if they were to infuse human cells into their being to become Flesh Eaters]], then [[FinalDeath they'll die for good.]]

* In ''VideoGame/XenobladeChronicles2,'' if a Driver dies, then all [[EmpatheticWeapon Blades]] they've resonated with will return to their [[HeartDrive Core Crystals]], [[DeathOfPersonality never to remember their past lives upon reawakening ever again.]] If a Blade were to share a piece of their Core Crystal with their Driver [[spoiler: or if they were to infuse human cells into their being to become Flesh Eaters]], then [[FinalDeath they'll die for good.]]

* This, along with traits of {{Synchronization}}, is the case between Demona and Macbeth in ''WesternAnimation/{{Gargoyles}}''.

* ''Anime/DragonBallZ'': If Piccolo were to die, then Kami would as well and vice-versa. This is because they were originally one person but Kami cast off his evilness in order to become guardian of Earth. That evilness turned into Piccolo. On the plus side, you only have to resurrect one to get both back. This is no longer an issue once the two of them [[FusionDance fuse back into one being]].
** Shenron and Porunga also cease to exist (and their respective Dragon Balls turn to stone) if their creator dies. For Shenron, that's Kami, later replaced by Dende after Kami fuses with Piccolo. For Porunga, that's Grand Elder Guru, later replaced by Elder Moori after Guru passes away.

This trope is not about people who can't stand to live apart from each other but are still physically able to do so; for those, head over to either LivingEmotionalCrutch or IfICantHaveYou. See also SoulJar when it also gives a form of immortality.

** [[spoiler:Whis]] also cannot exist without a [[spoiler:God of Destruction]] around, so if [[spoiler:Beerus]] dies, [[spoiler:Whis]] will cease to function until someone else takes up the role. [[spoiler:This is probably why he asked Goku and Vegeta if they wanted to replace Beerus if he dies, as a backup plan for it it happens.]]

* In ''Literature/DragonridersOfPern'', the dragons are symbiotes who literally can't face life without their rider: a dragon who fails to find a compatible rider upon hatching will die. If they bond to a rider and the rider dies, the psychological trauma causes the dragon to cross the DespairEventHorizon and commit suicide. The only exception is a queen dragon whose rider dies while the dragon is waiting for eggs to hatch -- she'll wait until just before Hatching to go ''Between'', and in the intervening time she won't leave her eggs, even to feed herself.

* The Destiny Bond move from ''VideoGame/{{Pokemon}}'' means that if the opponent's next move causes you to faint then so will they.

* Arthur and Shalott in ''Manga/AirGear''; Shalott was almost killed when another character kicked through his chest, [[YouFailBiologyForever damaging all his vital organs]], so Arthur's organs were transplanted into Shalott. Now Arthur has no organs, so he's dependent on a literal blood connection between him and Shalott for feeding and waste elimination, and will die in a couple hours if the connection is interrupted.

* In ''WesternAnimation/StevenUniverse'', [[spoiler:Steven's Gem is essentially his life force. After it was forcefully removed by White Diamond, his body turns pale and becomes weak, making him incapable of being able to move and requiring Connie's help to reunite with his Gem.]]

* Similarly, in ''Anime/DragonBallSuper'', it's revealed that if [[spoiler:the Supreme Kai]] were to die, so would [[spoiler:Beerus]]. The reverse is, presumably, true. Goku surmises that he could defeat the latter if he defeated the former, but then decides that wouldn't be any fun. [[spoiler:Beerus]] is less than amused.

* After Fry is critically injured in a car crash in ''WesternAnimation/{{Futurama}}'', [[MultipleHeadCase his head is attached to Amy's body]] to make sure he survives until his body is healed.

* In ''VideoGame/KnightsOfTheOldRepublicIITheSithLord'', the player character and his mentor Kreia are linked by a Force Bond, gaining each other strengths and weaknesses. This isn't exactly convenient - in particular, the player is made aware of the bond when Kreia loses a hand fighting the apparent BigBad Darth Sion to keep him at bay, and the player character half the ship away at this point immediately recoils in pain as if their hand got lopped off - so getting rid of it is one of the major plot points. [[spoiler:In the end, when Kreia turns out to be TheManBehindTheMan, she uses this as the player character's incentive to follow her to the final planet in the game - if they try to run or hide, Kreia will kill herself and thus also kill the PC no matter where they may be.]]

* In ''Film/StarWars'' continuity, the Tusken Raiders of Tattoine ride giant, shaggy beasts called banthas, which are bonded to their owners via a combination of training and affinity. If a bantha's rider dies, the bantha usually dies shortly after, often becoming feral and violent before dying.

[[folder:Fan Fiction]]
* In ''FanFic/BeingDeadAintEasy'', Yami Bakura reveals that [[spoiler:since Kaiba bonded Joey's soul to his own, Joey has been slowly killing Kaiba as his own condition worsens]].

* Due to plot complications involving the source of his agelessness, the eponymous protagonist of the German pulp series ''ProfessorZamorra'' has recently (as of this writing) become dependent on his friend Rhett Saris not so much to stay alive as to keep his ''youth''; without him, he would revert to his actual chronological age, which while not actually enough to kill him -- the series hasn't run quite that long yet -- probably would force him to retire from fighting the various forces of evil. (This is complicated by the fact that Rhett himself might yet end up turning into a fairly major demon himself if one of Hell's long-term plans is ever allowed to reach fruition...and they both know it.)
* In the ''Literature/HonorHarrington'' novels, it is common for bonded treecats to suicide after their human partner, or treecat romantic partner, dies. Since the natural lifespan of a treecat is considerably longer than that of a (pre-prolong) human, the bonding pretty much meant that bonding with a human meant that the treecat would sacrifice many decades of their lifespan.
** It is also stated that a human whose 'cat dies is likely to give up on their own life as well.
* Humans and their daemons in ''Literature/HisDarkMaterials''.
** A slight variation, in that it is possible to separate a daemon from their human with specialist equipment. In this case, both survive, but both are reduced to shadows of their former selves, as the daemon represents the human's soul. Separating them by any other means is fatal to both.

* ''Series/StargateSG1''

* ''Franchise/StarTrek''
** The same thing happened to Picard and Dr. Crusher on ''Series/StarTrekTheNextGeneration'', except it was an implant. It also made them able to read the other's thoughts.
** The Trill and their symbionts in the ''Franchise/StarTrek'' Verse: they share knowledge, and Trills can live just fine without a symbiote, but if a symbiote implanted in a Trill is removed the process invariably proves to be fatal to the host.
** The removal is not ''instantly'' fatal, nor the bonding instantly permanent. In one episode, a non-joined Trill ''hijacked'' the Dax symbiot from Jadzia and joined with it. Sisko recognized the new Dax, but, when the Trill refused to relinquish the symbiot, Sisko told him their friendship was over, since it would eventually mean Jadzia's death. Eventually, Jadzia recovered Dax and the other Trill was brought to justice.

* ''Tabletopgame/DungeonsAndDragons''

* In ''VideoGame/{{BioShock 2}}'' it is revealed that if an Alpha Model Big Daddy (the PlayerCharacter in the second game, different from the Big Daddies encountered in the first game) is too far away from his Little Sister, he either dies or lapses into a coma.

[[folder:Webcomic]]
* In ''Webcomic/GirlGenius'' Martellus tries to control Agatha this way. [[spoiler: He changes her body's chemistry so that she needs to be around him to survive. If he dies so does she. Agatha gets around this by applying whatever he did to himself to a wasp eater. Although she still needs one of them near to live, she is no longer dependant solely on Martellus.]]

* ''WesternAnimation/CodeLyoko'': Although Aelita is materialized in the second season, XANA ensured the kids couldn't CutTheJuice on him by linking Aelita to the Supercomputer. She would lapse into unconsciousness whenever the machine is turned off -- and a too long interruption would make her heart stop.

* In one episode of ''WesternAnimation/{{Ben 10}}'', Ben and Kevin are captured and forced into GladiatorGames. They are shackled together by an energy shackle so that if one dies, the other does too.

* Max and Steel in the ''[[MaxSteel2013 rebooted version of Max Steel]]''. Without Max, Steel will run out of power and shut down for good. Without Steel, Max would basically explode.

* In the first ''Literature/{{Neogicia}}'' novel, Saly, the protagonist undergoes BioAugmentation and wakes up with a secon level of consciousness that seems to have developped to avoid sensory overload. In the second, [[spoiler:it turns out to be actually be an entity using her as host body, which fills very specific critera seldom found in the general population. That entity is ready to go to lengths much greater that what Saly would consider acceptable to keep her alive and can take over in an emergency]].