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Though some theories are grouped together as lists, you can sign several on the same list if they are not mutually exclusive.

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Don't put your name in a bet in a season's folder after the season's finished. Put it in the bet in the next season's folder.

Season 3

Once the Crystal Gems are done staying at the barn, Peridot will move into...

Amethyst's room: honeyishrunkmyself
The barn: thatother1dude, GregGalaxy114, Crossover-Enthusiast
A new room in the temple: Booster137, BNSF1995
Steven's house: MidnightTerra, SalFishFin
Nowhere, because she'll be somehow indisposed for the rest of the season: Sazley
Garnet's room: MightyMatilda

Gem Corruption is caused by:

Being on Earth:
A Homeworld weapon: honeyishrunkmyself, Ruise, SalFishFin, Crossover-Enthusiast, Booster137, Septentrion, Tabs, TaylorHyuuga, Nightelf37, DeathsApprentice, KGBtheRussianSpy
Gemstone damage Rose's tears can't heal: Candhfan621
Poofing and regenerating too much:
Emotional turmoil: Cailleach, MidnightTerra, GregGalaxy114
Repeated death-related trauma, making them go insane: bigfatcarp93
'A special power that only the Diamonds have: TaylorHyuuga, Tabs
Something else: ^noteFusion with an already Corrupted Gem
Won't be revealed this season: thatother1dude

Peridot's first Fusion will be with:

Garnet: MidnightTerra, GregGalaxy114
Amethyst: thatother1dude, Septentrion, DeathsApprentice, That897Guy
Pearl: MightyMatilda
Steven: Tommet6, KGBtheRussianSpy
Lapis: Sugarp1e1, honeyishrunkmyself, Tabs, GreenInverness, TaylorHyuuga
No one this season: fsdfsdfsd, roundhouse-von-zeppelin, PitchBlackDarkrai, Crossover-Enthusiast

The Diamonds (re-)appearing include:

Blue: thatother1dude, MightyMatilda, Crossover-Enthusiast, DeathsApprentice, KarkatTheDalek
Pink: Tabs, bigfatcarp93
White: MidnightTerra
Yellow: thatother1dude, honeyishrunkmyself, Crossover-Enthusiast, Booster137, GregGalaxy114, Septentrion, Tabs, DeathsApprentice, KarkatTheDalek, PitchBlackDarkrai
None this season:

Lion is:

A Corrupted Gem: SmartGirl333, SalFishFin, MasterParadox, TheRedSquirrel
Something Rose made: RonnieR15, SalFishFin,^* TaylorHyuuga, Tabs^*, DeathsApprentice, MidnightTerra^*A construct similar to the Holo-Pearls
A Lion/Gem fusion: Hcobb
A type of creature we've never heard of before: bigfatcarp93
Pink Diamond: PoweRespect, Zadia
Pink Diamond's Pearl: SmartGirl333, MasterParadox, roundhouse-von-zeppelin
Literally just a magic lion:
An Earth lion infused with magic:
An alien Rose Quartz found on another planet:
None of the above:
Won't be revealed this season: thatother1dude, honeyishrunkmyself, Cailleach, Crossover-Enthusiast, GregGalaxy114, PitchBlackDarkrai

Peridot's Gem Weapon is:

The EMP already shown in Warp Tour: Ruise, SmartGirl333, GregGalaxy114
A drill: Booster137
A dagger:
Summonable limb enhancers: thatother1dude
A gun:
A slingshot: DeathsApprentice
A windmill Shuriken: otakukun
A hammer:
Peridot can't summon a weapon: MidnightTerra, Crossover-Enthusiast
None of the above: ^{What it actually is}Ferrokinesis (metal control)
Won't be revealed this season:

Pearl belonged to:

Rose Quartz: honeyishrunkmyself, GregGalaxy114
White Diamond: SalFishFin, Sazley, TheRedSquirrel, Tabs, PitchBlackDarkrai
Pink Diamond: Cailleach, DeathsApprentice, MidnightTerra, TaylorHyuuga, Zadia
Someone else:
Won't be revealed this season: thatother1dude, Crossover-Enthusiast, bigfatcarp93, roundhouse-von-zeppelin

The opening sequence will change:

And add Peridot: MidnightTerra, MightyMatilda, TaylorHyuuga, GregGalaxy114, Septentrion, Nightelf37, DeathsApprentice
And add Lapis: MidnightTerra, Septentrion, TaylorHyuuga, Nightelf37, DeathsApprentice
And add Bismuth:
And not add any new Gems:
Not this season: thatother1dude, honeyishrunkmyself, Crossover-Enthusiast, BNSF1995, AdricDePsycho, Tabs, PitchBlackDarkrai

Peridot will be poofed and get a Crystal Gem redesign:

This season: MidnightTerra, Ruise, SalFishFin, Crossover-Enthusiast, GregGalaxy114, Tabs, DeathsApprentice
Not this season: thatother1dude, PitchBlackDarkrai

By the end of the season, Lapis's relation to the Crystal Gems as a whole will be:

Member: Sugarp1e1, honeyishrunkmyself, BNSF1995
Ally: thatother1dude, Cailleach, Crossover-Enthusiast, Booster137, kraas, TaylorHyuuga, AdricDePsycho, GregGalaxy114, Septentrion, Tabs, DeathsApprentice, PitchBlackDarkrai
Neutral: MidnightTerra^*
Enemy (separate):

More Homeworld Gems will come to Earth:

A "non-defective" Amethyst: MidnightTerra, Cailleach, Crossover-Enthusiast, Septentrion, Tabs, DeathsApprentice
Another Rose Quartz: Crossover-Enthusiast
Another Pearl:
More Rubies: thatother1dude, Crossover-Enthusiast, SmartGirl333
New Gem types: MidnightTerra, Crossover-Enthusiast, TaylorHyuuga^*Either Bismuth or Emerald, BNSF1995, GregGalaxy114, Septentrion, Tabs, DeathsApprentice
Another Jasper: Crossover-Enthusiast^*
A Diamond:
Not this season:

We will see more Crystal Gems:

In a flashback: Cailleach, honeyishrunkmyself, SmartGirl333, Booster137, Crossover-Enthusiast, AdricDePsycho, GregGalaxy114, Septentrion, Tabs, DeathsApprentice
With a Corrupted Gem being healed: Crossover-Enthusiast, TaylorHyuuga, MidnightTerra
The only Crystal Gems were Garnet, Amethyst, Pearl, and Rose Quartz:
Not this season: thatother1dude, honeyishrunkmyself
Another Crystal Gem survived the war:

Lapis was in the mirror because:

She was being punished: AdricDePsycho, GregGalaxy114, Crossover-Enthusiast, MidnightTerra
She was a Homeworld Gem taken by the Crystal Gems as a P.O.W.: BNSF1995, TaylorHyuuga
She was mistaken for dead: honeyishrunkmyself, kraas
Won't be revealed this season: thatother1dude
None of the above:^{What actually happened}

Steven's first Gem Fusion will be with:

Garnet: BNSF1995
Amethyst: Crossover-Enthusiast, MidnightTerra
Pearl:
Peridot: TaylorHyuuga, Cailleach, DeathsApprentice
Lapis: bigfatcarp93
Steven can't fuse with other Gems, only humans: Sazley
Won't be revealed this season: thatother1dude, Tabs, roundhouse-von-zeppelin, PitchBlackDarkrai

Peridot's star will be:

On her chest: BNSF1995, Cheedo, Crossover-Enthusiast, Tabs
On her knees: Sazley, DeathsApprentice
Her visor: bigfatcarp93
Her hair: GregGalaxy114, roundhouse-von-zeppelin, Attila12
On a piece of clothing not part of her Gem form: MidnightTerra
Where her Diamond symbol currently is: TaylorHyuuga, DeathsApprentice, Attila12
None of the above:
Won't be revealed this season: PitchBlackDarkrai, thetoonamrose

By the end of the season, Jasper will be:

Still MIA:
An ally, still on Earth:
Neutral, still on Earth: Crossover-Enthusiast, honeyishrunkmyself, Tabs, Nightelf37, DeathsApprentice
An enemy, still on Earth: TaylorHyuuga, Septentrion, bigfatcarp93, PitchBlackDarkrai, MidnightTerra
Back on Homeworld:
Shattered: Luckofthedrawreborn
Corrupted: Crossover-Enthusiast
Bubbled^*: Crossover-Enthusiast

Centipeetle is a(n):

Jade: bigfatcarp93
Chrysoprase: Crossover-Enthusiast, Nightelf37, TaylorHyuuga, DeathsApprentice, SmartGirl333, KGBtheRussianSpy, PitchBlackDarkrai
Green Onyx:
Emerald: Tabs
Serpentine:
Green Moss Agate:
Unakite:
Maw Sit Sit: Cheedo, roundhouse-von-zeppelin
Era 1 Peridot: Booster137
Nephrite: MidnightTerra
None of the above:
Won't be revealed this season: SuperIdiotMan00

Centipeetle's alignment was:

Crystal Gem:
Homeworld Gem: TaylorHyuuga
Neutral/Neither:

Smoky Quartz is:

An entirely new Gem:
A Fusion between Steven/Rose and Garnet: bigfatcarp93
A Fusion between Steven/Rose and Amethyst: MidnightTerra, Crossover-Enthusiast, Tabs
A Fusion between Steven/Rose and Bismuth:
A Fusion between Jasper and Bismuth:
A Fusion between Amethyst and Bismuth:
A Fusion between Jasper and Amethyst: Foxgaze
A Fusion between Jasper and a Corrupted Gem: SuperIdiotMan00, PitchBlackDarkrai
None of the above:

By the end of the season, Bismuth will be:

Staying with the Crystal Gems at the temple/near Beach City:
Allied with the Crystal Gems, but operating in another part of the world:
Staying in the barn with Lapis and Peridot:
Bubbled again: Booster137, TaylorHyuuga, PitchBlackDarkrai, Crossover-Enthusiast, MidnightTerra
Shattered:
Corrupted:

Gems that will be poofed (but not necessarily remain in their gems) this season:

Ruby:
Sapphire:
Pearl:
Lapis: MidnightTerra, Tabs
Peridot: SuperIdiotMan00, MidnightTerra, Tabs, Crossover-Enthusiast, Booster137, TaylorHyuuga
Jasper: Tabs, PitchBlackDarkrai, Crossover-Enthusiast
Bismuth: Tabs, Booster137, TaylorHyuuga
Amethyst (more than once): TaylorHyuuga, Crossover-Enthusiast, Booster137,

"Here Comes a Thought" will be sung by:

Garnet:
Sapphire:
Ruby:
Amethyst:
Pearl:
Steven:
Connie:
Lapis:
Peridot:
No one this season: Crossover-Enthusiast

Season 4

Peridot's first Fusion will be with:

Garnet: Crossover-Enthusiast, Mudstar423, thetoonamirose
Amethyst: That897Guy, Attila12
Pearl: Monkcoon
Steven: Rinsankajugin, valozzy, kingTARDIS
Lapis: MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, AdricDePsycho, objection42, Booster137, Oceanstuck, GreenFablesInverness, BNSF1995, MayaTH, Yoyomom, JiminysJournal
Peridot can't Fuse:
No one this season: Krwzprtt

The Diamonds (re-)appearing include:

Blue: MidnightTerra, CodeXYZ, Crossover-Enthusiast, Oceanstuck, Tabs, Attila12, JiminysJournal
Pink (In a flashback): Crossover-Enthusiast, MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, AdricDePsycho, Rinsankajugin, CodeXYZ, Booster137, valozzy, Attila12, MayaTH, Yoyomom
White: Crossover-Enthusiast, MidnightTerra, Tabs, TaylorHyuuga, CodeXYZ, AndyMouse
Yellow: MidnightTerra, Tabs, roundhouse-von-zeppelin, AdricDePsycho, CodeXYZ, Booster137, valozzy, Attila12, Mudstar423, MayaTH, JiminysJournal
None this season:

Lion is:

A Corrupted Gem:
Something Rose made: MidnightTerra, Mudstar423
A Lion/Gem fusion:
A type of creature we've never heard of before:
Pink Diamond's Pearl:
Literally just a magic lion: JiminysJournal
An Earth lion infused with magic: Rinsankajugin, TaylorHyuuga, Oceanstuck, Tabs, Attila12, MayaTH
An alien Rose Quartz found on another planet:
An extension of Rose's Consciousness:
Greg's dead cat that Rose somehow brought back to life: Crossover-Enthusiast, roundhouse-von-zeppelin
Rose's other half: Yoyomom
None of the above: objection42
Won't be revealed this season: thatother1dude, AdricDePsycho, Krwzprtt

Pearl belonged to:

Rose Quartz: JiminysJournal
White Diamond: Crossover-Enthusiast, Tabs, roundhouse-von-zeppelin, ThunderingAlicorn, AndyMouse, MayaTH
Pink Diamond: MidnightTerra, TaylorHyuuga, AdricDePsycho, Rinsankajugin, valozzy, JiminysJournal
Someone else:
Won't be revealed this season: thatother1dude, CodeXYZ, Krwzprtt

The opening sequence will change:

And add Peridot: MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, FelipeXicao, JiminysJournal
And add Lapis: MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, Rinsankajugin, FelipeXicao, JiminysJournal
And add Bismuth:
And not add any new Gems:
Not this season: Crossover-Enthusiast, AdricDePsycho, Booster137, valozzy, Attila12, MayaTH, Krwzprtt

Peridot will be poofed and get a Crystal Gem redesign:

This season: Crossover-Enthusiast, Tabs, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, AdricDePsycho, Rinsankajugin, Booster137, Oceanstuck, valozzy, BNSF1995, Attila12, objection42, MayaTH, JiminysJournal, Krwzprtt
Not this season:

Peridot's star will be:

On her chest: Crossover-Enthusiast, Tabs
On her knees: Crossover-Enthusiast
Her visor: Rinsankajugin, Krwzprtt
Her hair: thatother1dude, Crossover-Enthusiast, roundhouse-von-zeppelin, MayaTH, Attila12
On a piece of clothing not part of her Gem form: MidnightTerra, MayaTH
Where her Diamond symbol currently is: TaylorHyuuga, AdricDePsycho, Oceanstuck, jotunheimm, valozzy, AndyMouse
Across her chest, over her shoulder: JiminysJournal
None of the above:
Won't be revealed this season:

More Homeworld Gems will come to Earth:

A "non-defective" Amethyst: Crossover-Enthusiast, Rinsankajugin, Tabs, MayaTH
Another Rose Quartz: Rinsankajugin
Another Pearl:
New Gem types: Crossover-Enthusiast, thatother1dude, roundhouse-von-zeppelin, AdricDePsycho, Tabs, CodeXYZ, valozzy, MayaTH ^noteAquamarine and Topaz
Another Jasper:
A Diamond: roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, CodeXYZ
Not this season:

Jasper will be uncorrupted:

This season: Crossover-Enthusiast, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, Tabs, Booster137, Attila12
Not this season: thatother1dude, AdricDePsycho, Oceanstuck, valozzy, objection42, MayaTH, JiminysJournal, Krwzprtt

Centipeetle will be uncorrupted:

This season: Crossover-Enthusiast, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, Tabs, Oceanstuck, Attila12, MayaTH
Not this season: thatother1dude, AdricDePsycho, CodeXYZ, valozzy, objection42, JiminysJournal, Krwzprtt

Centipeetle is a(n):

Jade:
Chrysoprase: Crossover-Enthusiast, TaylorHyuuga
Green Onyx:
Emerald: Yoyomom
Serpentine:
Green Moss Agate:
Unakite:
Maw Sit Sit: roundhouse-von-zeppelin, Rinsankajugin, Cheedo
Era 1 Peridot:
Nephrite: MidnightTerra, CodeXYZ, Booster137, That897Guy, objection42, Attila12, MayaTH
None of the above:
Won't be revealed this season: thatother1dude, AdricDePsycho, CodeXYZ, valozzy, JiminysJournal, Krwzprtt

Gems that will be poofed this season:

Ruby: Crossover-Enthusiast, MidnightTerra, Rinsankajugin, Tabs, MayaTH, Yoyomom
Sapphire: Crossover-Enthusiast, MidnightTerra, Rinsankajugin, Tabs, MayaTH, Yoyomom
Pearl: MidnightTerra, Tabs, thatother1dude, Rinsankajugin, CodeXYZ, Yoyomom, Crossover-Enthusiast
Lapis: Tabs, Rinsankajugin, objection42, JiminysJournal
Peridot: Crossover-Enthusiast, MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, CodeXYZ, Booster137, Oceanstuck, valozzy, objection42, MayaTH, JiminysJournal, Attila12, Krwzprtt
Amethyst: Rinsankajugin, CodeXYZ, Booster137, objection42, JiminysJournal
Centipeetle:
No one this season:

"Here Comes a Thought" will be sung by:

Garnet: roundhouse-von-zeppelin
Ruby: jotunheimm
Sapphire: whitehowl
Amethyst:
Pearl:
Steven:
Rose:
Greg:
Connie: Crossover-Enthusiast
Stevonnie:
Lapis:
Peridot:
Jasper:
Bismuth:
Centipeetle:
Yellow Diamond: Rinsankajugin
Yellow Diamond's Pearl: Rinsankajugin
Someone else:
No one this season:

Gems that will be un-bubbled this season:

Jasper: MidnightTerra, Tabs, Crossover-Enthusiast, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, CodeXYZ, Booster137, Attila12, Krwzprtt
Bismuth: Crossover-Enthusiast, Rinsankajugin, CodeXYZ, Attila12, FelipeXicao, MayaTH
Another Corrupted Gem: Crossover-Enthusiast, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, Tabs
None this season:

Fusions that will occur this season:

Opal: MidnightTerra, Tabs, Crossover-Enthusiast, thatother1dude, roundhouse-von-zeppelin, Rinsankajugin, CodeXYZ, Attila12, MayaTH, Yoyomom, JiminysJournal
Sugilite: MidnightTerra, Tabs, Crossover-Enthusiast, Rinsankajugin, CodeXYZ, jotunheimm
Sardonyx: MidnightTerra, Tabs, Crossover-Enthusiast, thatother1dude, roundhouse-von-zeppelin, Rinsankajugin, TaylorHyuuga, CodeXYZ
- Sardonyx appears again:
Smoky Quartz: MidnightTerra, Tabs, Crossover-Enthusiast, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, CodeXYZ
- Smoky Quartz appears again: Crossover-Enthusiast, TaylorHyuuga, Tabs, valozzy, MayaTH
Rainbow Quartz: MidnightTerra, Rinsankajugin, Tabs, Yoyomom, JiminysJournal, MayaTH
Steven + Garnet: MidnightTerra, Rinsankajugin
Steven + Peridot: Rinsankajugin, CodeXYZ, valozzy, MayaTH
Steven + Lapis: MidnightTerra
Lapis + Peridot: MidnightTerra, Tabs, thatother1dude, roundhouse-von-zeppelin, TaylorHyuuga, Rinsankajugin, CodeXYZ, Booster137, objection42, MayaTH, Yoyomom, JiminysJournal
Lapis + Pearl:
Lapis + Amethyst:
Lapis + Garnet:
Malachite:
Peridot + Pearl:
Peridot + Garnet: MidnightTerra, Crossover-Enthusiast
Peridot + Amethyst: Monolaf317, Rinsankajugin, jotunheimm, reallytired
Stevonnie: MidnightTerra, Tabs, Crossover-Enthusiast, roundhouse-von-zeppelin, Rinsankajugin, TaylorHyuuga, CodeXYZ
- Stevonnie appears again: Crossover-Enthusiast, Oceanstuck, Tabs, valozzy, MayaTH, JiminysJournal, Krwzprtt
Alexandrite: Tabs, Crossover-Enthusiast, Rinsankajugin, CodeXYZ, MayaTH
The Temple Fusion: MidnightTerra, Rinsankajugin, Krwzprtt
The Fusion shown in "Historical Friction": Crossover-Enthusiast, Rinsankajugin, Tabs, jotunheimm
Steven + another human: Crossover-Enthusiast, Rinsankajugin
Steven + Lion: Yoyomom
Something else: CodeXYZ, Tabs ^noteTopaz

Characters that will sing this season:

Amethyst: Crossover-Enthusiast, Tabs, JiminysJournal ^notecounting the shorts
Pearl: Crossover-Enthusiast, Tabs, JiminysJournal ^notecounting the shorts
Steven: Crossover-Enthusiast, Tabs, JiminysJournal ^notecounting the shorts
Connie: Crossover-Enthusiast (counting the shorts)
Ruby:
Sapphire:
Garnet: JiminysJournal
Greg: Tabs, Crossover-Enthusiast
Rose:
Peridot:
Lapis: Crossover-Enthusiast, reallytired
Jasper:
Bismuth:
Mystery Girl:
Someone else: Crossover-Enthusiast ^note

Mystery Girl's name is:

Star:
Storm: reallytired
Sugar:
Susan: Crossover-Enthusiast
Selena:
Scarlet:
Sheena: objection42, JiminysJournal
Stella: Booster137
Sage:
Sue Crose: Attila12
Susan Crose: Crossover-Enthusiast
Something Else: Cloud557
Won't be revealed this season: Krwzprtt, valozzy, Tabs, Cloud557

If Lapis joins the Crystal Gems, her star will be:

On a sleeve: JiminysJournal
On her belt: Krwzprtt, AndyMouse, MayaTH
She won't be poofed this season: Tabs, Cloud557, Crossover-Enthusiast
She won't join this season: Crossover-Enthusiast, Cloud557

White Diamond has no known followers, and was never discussed by Yellow or Blue, because:

She's a Fusion of several Diamonds:
The other Diamonds dislike her:
She's so radically different compared to the other Diamonds that they don't treat her like a person: thatother1dude
She became incredibly distant after the war and the others don't feel comfortable talking about her: Crossover-Enthusiast
Her subjects aren't required to go off world that much, and Yellow and Blue just didn't think of mentioning her: Oceanstuck
She's incapacitated in some way:
None of the above: Cloud557
Won't be revealed this season: Tabs, Cloud557

New instruments/genres to be used for new characters:

Calypso Drum:
Techno Swing:

Things Ronaldo stated in "Rocknaldo" that will occur or turn out to be true:

The appearance of a Bloodstone:
An organic creature with a crushed-up Gem coursing through its blood: TaylorHyuuga
Steven getting an outfit change that shows off his gem:
Steven considering Connie to be his girlfriend: TaylorHyuuga
Mind control minerals in the water supply:
A Gem's pocket dimension being known as a "Mud Dimension":
None this season: Cloud557, TaylorHyuuga, Crossover-Enthusiast

Inside Lion's chest is:

Some sort of device:
Pink Diamond's shards:
Another bubbled Gem:
A book or other record on the Gem war:
Not revealed this season:

The smaller Gem in the promo is:

Aquamarine: Monolaf317
An Era 2 Lapis Lazuli:
Some other Gem entirely:
Not a Gem:

Season 5

Episode 1 of Season 5 will take place...

In space: IPhobos
On Earth:
On Homeworld: Monolaf317, TaylorHyuuga
At the Zoo:
Elsewhere:

Peridot's first Fusion will be with:

Garnet:
Amethyst: Motheroftides
Pearl:
Steven: Ariel Lightning, TheIllusiveMonster
Lapis: thatother1dude, RxF, MayaTH, Tabs, CodeXYZ, JiminysJournal, RealityUnhinged, Tambry161, Mango-Pango, stewyworks333,The Dread Gazebo
Peridot can't Fuse: Ultimatum, valozzy, DanMat6288
No one this season: Solarina, ProdigalDaughter, Krwzprtt, Crossover-Enthusiast

The Diamonds (re-)appearing include:

Blue: thatother1dude, RxF, Crossover-Enthusiast, Tabs, Mango-Pango, Krwzprtt
Pink (In a flashback): RxF, Tabs, Mango-Pango, CodeXYZ, JiminysJournal
White: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Krwzprtt, Solarina, CodeXYZ, RealityUnhinged
Yellow: thatother1dude, Crossover-Enthusiast, Tabs, Mango-Pango, Krwzprtt
None this season:

Lion is:

A Corrupted Gem:
Something Rose made: thatother1dude, Tabs
A Lion/Gem Fusion:
A type of creature we've never heard of before:
Pink Diamond's Pearl:
Literally just a magic lion:
An Earth lion infused with magic: RxF, MayaTH, Mango-Pango, Krwzprtt, Solarina (specifically one that died and Came Back Strong when Rose resurrected him)
An alien Rose Quartz found on another planet:
An extension of Rose's Consciousness:
Greg's dead cat that Rose somehow brought back to life:
Rose's other half:
Offspring of the lions from "Buddy's Book":
The result of Homeworld experimenting on animals:
None of the above:
Won't be revealed this season: Crossover-Enthusiast

Pearl belonged to:

Rose Quartz: JiminysJournal, Ultimatum
White Diamond: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Ariel Lightning, MasterParadox, Solarina, The Dread Gazebo, Tambry161, Keshia, Veritastheeidolon, Attila12, rjd1922, ProdigalDaughter, TheIllusiveMonster, Motheroftides
Pink Diamond: jakeroo123, JiminysJournal, Mango-Pango, stewyworks333
Someone else: Mango-Pango
All four of the Diamonds:
Won't be revealed this season: Krwzprtt, CodeXYZ

The opening sequence will change:

And add Peridot: Mango-Pango, Krwzprtt, JiminysJournal, stewyworks333', RxF, ProdigalDaughter, TheIllusiveMonster
And add Lapis: Mango-Pango, Krwzprtt, JiminysJournal, stewyworks333
And add Bismuth:
And add someone else: Mango-Pango
And not add any new Gems:
And add more humans: Mango-Pango, stewyworks333, RxF
And bring Lars into the cookout: stewyworks333, RxF, TheIllusiveMonster
Not this season: Crossover-Enthusiast, MasterParadox, Solarina, CodeXYZ, Eggy0, DanMat6288

Peridot will be poofed and get a Crystal Gem redesign:

This season: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, Krwzprtt, Solarina, CodeXYZ, JiminysJournal, RealityUnhinged, Tambry161, nightelf37, valozzy, TheIllusiveMonster, DanMat6288
Not this season: stewyworks333, ProdigalDaughter

Peridot's star will be:

On her chest: Crossover-Enthusiast, Mango-Pango, Solarina
On her knees: Mango-Pango, Tabs
Her visor: Krwzprtt, bigfatcarp93
Her hair: thatother1dude^*, Mango-Pango
On a piece of clothing not part of her Gem form: MayaTH
Where her Diamond symbol currently is: RxF, TheIllusiveMonster, Motheroftides
Across her chest, over her shoulder^noteSimilar to this fanart: JiminysJournal
None of the above:
Won't be revealed this season: CodeXYZ, stewyworks333, ProdigalDaughter

Jasper will be uncorrupted:

This season: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, TheIllusiveMonster, Eggy0
Not this season: Krwzprtt, Solarina, CodeXYZ, JiminysJournal, nightelf37, stewyworks333, valozzy, ProdigalDaughter, rjd1922

Centipeetle will be uncorrupted:

This season: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Solarina, CodeXYZ, AndyMouse, Eggy0
Not this season: Krwzprtt, JiminysJournal, stewyworks333, valozzy, TheIllusiveMonster, Motheroftides

Centipeetle is a(n):

Jade: bigfatcarp93
Chrysoprase: nightelf37
Green Onyx:
Emerald:
Serpentine:
Green Moss Agate:
Unakite:
Maw Sit Sit:
Era 1 Peridot:
Nephrite: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Mango-Pango, CodeXYZ, AndyMouse, Attila12, ProdigalDaughter, veritastheeidolon, Eggy0
Cat's Eye:
Seraphinite:
Jadeite: Motheroftides
None of the above: Solarina
Won't be revealed this season: Krwzprtt, stewyworks333, valozzy, TheIllusiveMonster

Gems that will be poofed this season:

Ruby: MayaTH, Mango-Pango
Sapphire: MayaTH, Mango-Pango
Pearl: Crossover-Enthusiast, Mango-Pango, MasterParadox, TheIllusiveMonster
Lapis: thatother1dude, RxF, Tabs, Mango-Pango, JiminysJournal, nightelf37
Peridot: thatother1dude, MayaTH, Tabs, Mango-Pango, Krwzprtt, Solarina, JiminysJournal, nightelf37, Attila12, TheIllusiveMonster
Amethyst: CodeXYZ, JiminysJournal
Centipeetle:
Someone else^noteother than a Corrupted Gem: Mango-Pango, Crossover-Enthusiast, Solarina (the Zircon lawyers, Pink Diamond, two Jades)
No one this season:

Gems that will be un-bubbled this season:

Jasper: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Attila12
Bismuth: thatother1dude, RxF, Tabs, Mango-Pango, Attila12, ProdigalDaughter
Another Corrupted Gem: MayaTH, Tabs, Solarina, CodeXYZ, Mango-Pango (Biggs Jasper, then everyone in "Change Your Mind")
Another Rose Quartz: Solarina, Mango-Pango, stewyworks333
None this season: Krwzprtt, JiminysJournal, valozzy, TheIllusiveMonster

Fusions that will occur this season:

Opal: Tabs, Mango-Pango, Solarina, CodeXYZ, JiminysJournal
Sugilite: Tabs, Mango-Pango, Solarina, CodeXYZ
Sardonyx: thatother1dude, MayaTH, Tabs, Mango-Pango, Solarina, CodeXYZ, ProdigalDaughter
Smoky Quartz: thatother1dude, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, Solarina, CodeXYZ, Crossover-Enthusiast
Rainbow Quartz: MayaTH, Mango-Pango, Ariel Lightning, Krwzprtt, Crossover-Enthusiast, AnonFangeekGirl (both the original and Pearl+Steven)
Steven + Garnet: RxF, Mango-Pango, Solarina, CodeXYZ, Crossover-Enthusiast (Sunstone)
Steven + Ruby:
Steven + Sapphire:
Steven + Peridot: MayaTH, Tabs, Mango-Pango, TheIllusiveMonster
Steven + Lapis: Mango-Pango
Steven + Opal:
Steven + Sugilite:
Steven + Sardonyx:
Steven + a human that isn't Connie: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, Ariel Lightning, Krwzprtt, Solarina, CodeXYZ, nightelf37, TheIllusiveMonster
Steven + any Gem + any human:
Steven + Lion:
Lapis + Peridot: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Krwzprtt, CodeXYZ, JiminysJournal, RealityUnhinged, Tambry161
Lapis + Pearl:
Lapis + Amethyst:
Lapis + Garnet:
Malachite:
Peridot + Pearl: EricW
Peridot + Garnet:
Peridot + Amethyst: Mango-Pango, RxF
Stevonnie: thatother1dude, RxF, MayaTH, Tabs, Mango-Pango, Ariel Lightning, Krwzprtt, Solarina, CodeXYZ, RealityUnhinged, Crossover-Enthusiast, valozzy
Alexandrite: thatother1dude, RxF, Tabs, Mango-Pango, Solarina, CodeXYZ
The Temple Fusion: thatother1dude, Mango-Pango (Obsidian)
The Fusion shown in "Historical Friction":
Something else: Mango-Pango, Krwzprtt, Solarina, CodeXYZ, Tabs, TheIllusiveMonster (a fusion of two Jades)
None this season (impossible as it may be):

Characters that will sing this season:

Amethyst: Tabs, Mango-Pango, Solarina, CodeXYZ
Pearl: Tabs, Mango-Pango, Krwzprtt, Solarina, CodeXYZ, JiminysJournal, stewyworks333, ProdigalDaughter
Steven: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, Krwzprtt, Solarina, CodeXYZ, JiminysJournal, RealityUnhinged, Tambry161, stewyworks333
Connie: Tabs, Mango-Pango, CodeXYZ, stewyworks333, RxF
Ruby: Mango-Pango
Sapphire: CodeXYZ, Mango-Pango
Garnet: Tabs, Mango-Pango, Krwzprtt, Solarina, CodeXYZ, JiminysJournal, stewyworks333
Greg: thatother1dude, Tabs, Mango-Pango, CodeXYZ, JiminysJournal, Tambry161, stewyworks333, TheIllusiveMonster
Rose: thatother1dude, Tabs, Mango-Pango, CodeXYZ, JiminysJournal
Peridot: Tabs, Mango-Pango, stewyworks333
Lapis: MayaTH, Tabs, Mango-Pango, Solarina, CodeXYZ, AndyMouse, stewyworks333, RxF, TheIllusiveMonster
Jasper: Mango-Pango, RxF
Bismuth:
Mystery Girl: RxF, stewyworks333
Opal: JiminysJournal
Lars: Mango-Pango, bigfatcarp93, stewyworks333, RxF
Sadie:
Someone else: Crossover-Enthusiast, Tabs, Mango-Pango, Solarina, CodeXYZ, stewyworks333, RxF (Buck, Jenny, Blue Diamond^note)

Mystery Girl's name is:

Star:
Storm: Ariel Lightning
Sugar:
Susan: Tambry161
Selena: RxF
Sheena: Mango-Pango, MasterParadox, CodeXYZ, JiminysJournal, TheIllusiveMonster, rjd1922
Stella: bigfatcarp93, stewyworks333
Sabina: valozzy, ProdigalDaughter, Crossover-Enthusiast
Sharon: WallyWolf
Something else: Krwzprtt, RealityUnhinged
Won't be revealed this season:

If Lapis joins the Crystal Gems, her star will be:

On her sleeve:
On her belt:
On her chest: EricW (not a full star, but the top of one is on her tank top)
On her skirt:
Around her waist: JiminysJournal
Where her Diamond symbol currently is: Mango-Pango, Krwzprtt, RxF, AndyMouse
Somewhere else:
She won't be poofed this season: Crossover-Enthusiast, Solarina, stewyworks333, ProdigalDaughter
She won't join this season: Crossover-Enthusiast, Solarina, CodeXYZ, Tabs, Veritastheeidolon, valozzy, TheIllusiveMonster, Eggy0

White Diamond has no known followers, and was never discussed by Yellow or Blue in "That Will Be All", because:

She's a Fusion of several Diamonds: JiminysJournal
The other Diamonds dislike her:
The other Diamonds are afraid of her: RealityUnhinged, Tambry161, AndyMouse, stewyworks333
She's so radically different compared to the other Diamonds that they don't treat her like a person: thatother1dude
She became incredibly distant after the war and the others don't feel comfortable talking about her: RxF, Crossover-Enthusiast, AnonFangeekGirl
Her subjects aren't required to go off world that much, and Yellow and Blue just didn't think of mentioning her: MayaTH, Mango-Pango, Krwzprtt
She's incapacitated in some way: TheIllusiveMonster
Yellow and Blue ARE her followers, and by proxy so is the entire Gem race, and discussing her was simply unnecessary at the time: Rondomi
None of the above: MasterParadox, Solarina, CodeXYZ, Tabs
Won't be revealed this season: EricW, valozzy

Things Ronaldo stated in "Rocknaldo" that will occur or turn out to be true:

The appearance of a Bloodstone: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, Solarina, CodeXYZ, nightelf37
An organic creature with a crushed-up Gem coursing through its blood: MayaTH, Mango-Pango, Tabs
Steven getting an outfit change that shows off his gem: RxF, MayaTH, RealityUnhinged
Steven considering Connie to be his girlfriend: thatother1dude, RxF, MayaTH, Krwzprtt, MasterParadox, Mango-Pango, Tambry161, stewyworks333, TheIllusiveMonster
Mind control minerals in the water supply: Tabs, Solarina, bigfatcarp93, Mango-Pango, Crossover-Enthusiast
A Gem's pocket dimension being known as a "Mud Dimension": Tabs, Solarina, Mango-Pango
None this season:

Inside Lion's chest is:

Some sort of device: RxF
Pink Diamond's shards: thatother1dude, stewyworks333
Another bubbled Gem:
A book or other record on the Gem war: MayaTH, Tabs, Mango-Pango, Krwzprtt, nightelf37, TheIllusiveMonster
Pink Diamond's Pearl:
Nothing; the chest is empty:
Pink Diamond bubbled: Rondomi
An additional recording for Steven made in case he learns the truth about Pink Diamond: DanMat6288, AnonFangeekGirl
A letter for Steven:
Something completely mundane: Crossover-Enthusiast, Mango-Pango
Something else: Solarina, bigfatcarp93, Mango-Pango
Won't be revealed this season: MasterParadox, CodeXYZ, JiminysJournal, valozzy

The ruins in "Lion 4" are:

Where Lion was born/was revived: thatother1dude, MayaTH, Tabs, Mango-Pango, Tambry161, RxF
Where Pink Diamond's arm/leg ship crashed: thatother1dude, Crossover-Enthusiast, MayaTH, Mango-Pango, Krwzprtt, MasterParadox, Solarina, Veritastheeidolon, stewyworks333, ProdigalDaughter, AnonFangeekGirl, DanMat6288
None of the above: TheIllusiveMonster
Won't be revealed this season: CodeXYZ

White Diamond will be revealed:

This season: thatother1dude, RxF, Crossover-Enthusiast, MayaTH, Tabs, Mango-Pango, MasterParadox, Solarina, CodeXYZ, RealityUnhinged, stewyworks333, TheIllusiveMonster
Not this season: JiminysJournal, nightelf37, EricW, valozzy, Krwzprtt

Ashly Burch is voicing:

Mystery Girl: Crossover-Enthusiast, Krwzprtt, RxF
A new Gem: Mango-Pango, thatother1dude, Solarina (Rutile)
A new human:
A new Fusion: MayaTH, Tabs, Ariel Lightning
No one this season:

The new Gem in the Wanted promo is a(n):

Moonstone: Mango-Pango, Crossover-Enthusiast, RxF
Turquoise:
Zircon: Solarina
Blue Spinel:
Tanzanite:
Iolite:
Kyanite:
Benitoite:
Chalcedony:

Homeworld Gems that will appear this season:

Any member(s) of the Ruby Squad^noteDoc, Eyeball, Navy, Army, Leggy: Mango-Pango, RxF, Solarina (Eyeball)
Any member(s) of the Famethyst: Mango-Pango, RxF, Solarina, CodeXYZ
Holly Blue Agate: Mango-Pango, RxF
Another Ruby not part of the Ruby Squad: Mango-Pango, Solarina (Multiple extras in "Together Alone")
Another Sapphire: Mango-Pango, Solarina (Padparadscha, who's a type of Sapphire, and other standard Sapphires in "Together Alone")
Another Pearl^noteother than Yellow Pearl and Blue Pearl: Mango-Pango, Solarina, Tabs, Tambry161 (White Pearl)
Another Quartz soldier: Mango-Pango, Solarina, Tambry161 (Multiple Amethysts in "Now We're Only Falling Apart" and "Together Alone")
Another Lapis Lazuli: Mango-Pango, Solarina
Another Peridot: Mango-Pango, RxF, Solarina, TheIllusiveMonster
Another Bismuth: Mango-Pango
Another Agate: Mango-Pango, Tabs
Another Aquamarine: Mango-Pango (in the crowds of "Legs From Here to Homeworld" and "Together Alone")
Another Topaz: Mango-Pango (in the crowd of "Now We're Only Falling Apart", guards in "Familiar")
A non-Corrupted version of any Corrupted Gem we've seen: Mango-Pango, Solarina, CodeXYZ, Tabs (Centipeetle = Nephrite, plus everyone in the epilogue)
New Gem types^noteother than the one seen in the promo: Mango-Pango, RxF, Solarina (Rutile, Rhodonite, Fluorite, Emerald, Pebbles, Jade, many extras of unnamed type)

How the Crystal Gems will rescue Steven and Lars from Homeworld:

Lapis will fly to Homeworld^note: RxF
Pearl and Peridot will build a new ship:
Pink Diamond's arm/leg ship will be repaired:
Centipeetle's ship will be repaired:
The Homeworld Warp at the Galaxy Warp will be repaired:
Lion will warp the Gems to Homeworld: Solarina
Steven and Lars will escape on their own^note: Krwzprtt, thatother1dude, Crossover-Enthusiast
None of the above:

Pink Diamond was really shattered by:

Rose Quartz: thatother1dude, Tambry161, Crossover-Enthusiast, valozzy, Krwzprtt
- Corollary: If Rose did it, who was her accomplice (whether Rose knew or not), if she had one?
- Pink Diamond's Pearl: Crossover-Enthusiast, stewyworks333
- Our Pearl:
- White Diamond: AndyMouse, Motheroftides
- Yellow Diamond: nightelf37, valozzy
- Another Crystal Gem:
- A human:
- Someone else:
White Diamond: Mango-Pango, Paul_Geo
Yellow Diamond: bigfatcarp93, oiwa
Blue Diamond:
Another Crystal Gem:
Our Pearl: throwing_my_shades, Veritastheeidolon, rjd1922
Her Pearl: Mango-Pango, Crossover-Enthusiast
A human: Mouser
Herself:
Someone else:
Somebody other than the person who poofed her physical form: Veritastheeidolon
She wasn't actually shattered: CodeXYZ, JiminysJournal, RxF, TheIllusiveMonster, PandaXclone2
Won't be revealed this season: CodeXYZ, EricW, oiwa

Following their arrival to Earth, the Off Colors will stay:

At the Temple:
At the barn: Mango-Pango, TheIllusiveMonster
At Lars' house: Crossover-Enthusiast, bigfatcarp93, Tambry161, stewyworks333
In Bismuth's Forge:
In the Sun Incinerator:
Somewhere else: thatother1dude, nightelf37, EricW, Veritastheeidolon, Krwzprtt
The season will end after they make it to Earth, but before they decide where to stay: RxF
They won't make it to Earth this season: RealityUnhinged, Tabs, Eggy0

A Gem War will happen:

This season: RealityUnhinged,
Not this season: Crossover-Enthusiast, Mango-Pango, bigfatcarp93, Tabs, Tambry161, Veritastheeidolon, stewyworks333, EricW, RxF, valozzy, TheIllusiveMonster

The structure in Homeworld that resembles White Diamond is:

Her ship: Crossover-Enthusiast, Attila12, ProdigalDaughter, TheIllusiveMonster, rjd1922
A building: Mango-Pango
A statue: Tabs, RxF
White Diamond herself: thatother1dude
Something else:
Won't be revealed this season: EricW, Veritastheeidolon, stewyworks333, Krwzprtt, Eggy0

Lapis will betray the Crystal Gems and side with Homeworld:

But come back after an episode or two: EricW, AndyMouse
And become a recurring villain:
But will reveal she was faking it to sabotage Homeworld from the inside:
She'll betray them, but won't side with Homeworld/will stay neutral: Crossover-Enthusiast, RxF, valozzy
She won't betray them, period: Veritastheeidolon, stewyworks333, Attila12, Krwzprtt, TheIllusiveMonster, rjd1922, Tabs

"Escapism" will be sung by:

Steven: rjd1922
Lapis: thatother1dude, stewyworks333, Attila12, RxF, valozzy, TheIllusiveMonster
Lars:
Amethyst:
Pearl: ProdigalDaughter, ELST
Garnet:
Peridot:
Sadie: Krwzprtt
Ronaldo:
Topaz: Crossover-Enthusiast
Stevonnie: reallytired (their voice actress, but not them in-character)
Someone else: Eggy0, AnonFangeekGirl, DatLonerGirl

The winner of Beach City's mayoral election will be:

Bill Dewey:
Nanefua: thatother1dude
A third, possibly unknown candidate:

Lapis will return in a future episode:

And, knowing she can't run away from the fight forever, becomes a full-time member of the Crystal Gems: TheIllusiveMonster, AndyMouse
And will attack both sides:
She will side with the Crystal Gems, but not officially join them: valozzy, stewyworks333, Tabs
She will side with Homeworld and betray Steven and Peridot:
But will take a few episodes to be persuaded to fight:Krwzprtt
But will be mind-controlled by Homeworld: RxF

Sunshine Justice is:

A new Gem:
A new human: thatother1dude, stewyworks333, Tabs, TheIllusiveMonster
A new Fusion:
Mystery Girl: Crossover-Enthusiast, ThomasVeggieDramaFan, ProdigalDaughter, RxF
Someone else:
Won't be revealed this season:

Rainbow Quartz's weapon is:

An umbrella/parasol: Crossover-Enthusiast, PhiSat, EricW, AnonFangeekGirl
An axe: Kaiseror
A lance: 32_Footsteps
A pizza cutter: thatother1dude
Something else: Eggy0
Won't be revealed this season: stewyworks333, Motheroftides, rjd1922, Tabs

Concerning the truth about Pink Diamond, the Diamonds will:

Be utterly shocked: Eggy0, Crossover-Enthusiast, Tabs, EricW
Become furious: EricW, thatother1dude (Yellow)
Enter denial (i.e. try to disprove the truth): EricW (partial denial, as they don't accept the full truth of what Steven is)
Break down into tears: Eggy0, EricW (Blue does, Yellow doesn't quite)
Stop being vengeful and become friendlier to Steven and the Earth: Eggy0, Crossover-Enthusiast
Question the whole ordeal^*: Crossover-Enthusiast, Tabs, EricW
Launch an all-out attack on Earth and hunt Steven to shatter him for Pink's betrayal: BNSF1995
Some other reaction:
Not react in particular (i.e. remain the same as they were):
Not find out the truth at all:

Sapphire will run away:

To cool off: Eggy0 (in a literal sense)
And leave Earth somehow:
To contemplate: Tabs, EricW
To cry: Eggy0, AnonFangeekGirl
And betray the Crystal Gems to get her old position on Homeworld back: BNSF1995

Sapphire ran off to:

The Strawberry Battlefield:
The Sky Arena:
The Keystone Motel: Crossover-Enthusiast
The place where Garnet met Rose and Pearl again: Eggy0, EricW, thatother1dude
Bismuth's Forge:
Garnet's World (metaphorically): EricW
Somewhere else: Tabs (Rose's Fountain)

Characters who will learn the truth about Rose Quartz/Pink Diamond (besides the other Diamonds possibly):

Greg: Eggy0, EricW, thatother1dude, AnonFangeekGirl
Connie: Eggy0, EricW, thatother1dude
Peridot: EricW, Kaiseror, thatother1dude
Lapis: thatother1dude
Jasper: Eggy0, EricW
Bismuth: Eggy0, EricW, thatother1dude
Any (or every) member of the Ruby Squad^*Leggy, Navy, Doc, Eyeball, Army: Eggy0, EricW
The Off Colors: Eggy0, EricW, Kaiseror, thatother1dude
Holly Blue Agate/The Famethyst:
Aquamarine:
Topaz:
Someone else: EricW

Bismuth will be shattered by the Diamonds in "Reunited":

Yes: BNSF1995
No: Crossover-Enthusiast

Corrupted gems' state of corruption will be reversed by:

Steven: (only on Nephrite, briefly)
The Diamonds: (all of them, permanently)
Someone else:
No one this season: reallytired

White Diamond will agree to cure the corrupted gems on Earth:

Without precondition:
Only if Steven promises to stay on Homeworld: thatother1dude
She won't do it:

White Diamond will be convinced to reverse corruption and/or let Steven stay on Earth by:

Steven: thatother1dude
Connie: thatother1dude
Yellow Diamond:
Blue Diamond:
Pearl:

While locked up, Steven is going to communicate with:

Lars and the Off Colors:
Bismuth, Peridot, and Lapis: (just Bismuth, along with Greg and Lion; the other two were either still poofed or not around)
The Crystal Gems captured on Homeworld:
The other Diamonds:
Topaz:

The closing shot of the season finale will be:

Iris Out: thatother1dude
Smash to Black:
Fade to Black: Crossover-Enthusiast
Other:

The Movie

The movie's time frame is:

Pre-season four finale:
Between "Lars' Head" and "A Single Pale Rose": Burstkiller
Between "A Single Pale Rose" and "Reunited":
After the end of season five: TFSyndicate, thatother1dude, jTIS (two years after)
Ambiguous and/or impossible:

The unknown dark red gem from the Steven Universe: The Movie trailer is:

Morganite: RhymeBeat, dayandnight,
Red Diamond:
Bixbite:
Pink Diamond's Psycho Prototype:
A non-gem alien: BNSF1995
None of the above: (a Spinel)

In the movie:

A new recurring villain for the show will be introduced: jTIS
None of the above:

Things we'll discover happened during the timeskip:

Sadie and Lars start openly dating:
Steven and Connie start openly dating:, JoltNinja
The Zoomans move out of the Zoo:
Connie's parents find out about Stevonnie:
The box in Lion's mane was opened: (we don't know what was in there though)
None of the above:

The opening scene will take place:

Before the Time Skip: dayandnight, thatother1dude
After the Time Skip: (technically; it's shown in the present, but recalling the past)

The new fusion(s) introduced in the movie is/are:

Steven + Peridot: dayandnight, JoltNinja
Steven + Lapis: dayandnight, JoltNinja
Steven + Bismuth:
Steven + one of the Diamonds: dayandnight
Steven + a human who isn't Connie: dayandnight (Steven + Greg = Steg)
Peridot + Lapis: TurquoiseOwl, dayandnight, JoltNinja
Peridot + Bismuth:
Bismuth + Lapis:
Two or more of the Diamonds: dayandnight
A potential Crystal Gem combination never before seen^note:
Something else:

The villain's motive to destroy Earth's organic life:

She still thinks the Earth killed Pink Diamond:
She understands Steven is separate from Rose/Pink, but blames Steven for her death: thatother1dude,
Pink/Rose did something wrong to her, and she's seeking Revenge by Proxy: dayandnight
None of the above:

Steven Universe: Future

Peridot's first Fusion will be with:

Garnet: Crossover-Enthusiast
Amethyst: reallytired, Lattelawyer
Pearl:
Steven: GoblinCipher
Lapis: Aquaras, Tabs, Burstkiller, TFSyndicate, thatother1dude, rjd1922, stewyworks333, dayandnight, JoltNinja, TheOtakuNinja Vvv2024
Peridot can't Fuse: DJShy (Will never fuse)
No one this season:
Another Gem: Otakukun

Diamonds reappearing include:

Blue: Tabs, reallytired, TFSyndicate, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja, Vvv2024
Pink (In a flashback): Tabs, reallytired, thatother1dude, stewyworks333, JoltNinja, Vvv2024
White: Tabs, reallytired, TFSyndicate, Otakukun, thatother1dude, Lattelawyer, stewyworks333, dayandnight, JoltNinja, Vvv2024
Yellow: Tabs, reallytired, TFSyndicate, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja, Vvv2024
None this season:

The opening sequence will change:

And add Peridot: Tabs, realytired, Burstkiller, Otakukun, rjd1922, stewyworks333, dayandnight, JoltNinja
And add Lapis: Tabs, reallytired, Burstkiller, Otakukun, rjd1922, stewyworks333, dayandnight, JoltNinja
And add Bismuth: Tabs, reallytired, Burstkiller, Otakukun, rjd1922, stewyworks333, dayandnight, JoltNinja
And add more gems: Tabs, Otakukun, stewyworks333 (Various formerly-corrupted Gems, the Diamonds, Rubies, the Off Colors, Spinel, Jasper)
And not add any new Gems:
And add more humans: Tabs, Otakukun, stewyworks333 (Vidalia, Yellowtail, Mr. Dewey, Mr and Mrs Barriga, an unknown human next to Sadie)
And bring Lars into the cookout: Burstkiller, Otakukun, stewyworks333, dayandnight, JoltNinja
And replace "We Are The Crystal Gems" with a new song: Otakukun (A version of "Happily Ever After")
And keep "We Are The Crystal Gems", but a new version: Mouser, stewyworks333, JoltNinja
Not this season: thatother1dude

Gems that will be poofed this season:

Ruby:
Sapphire:
Pearl:
Lapis:
Peridot:
Nephrite:
Amethyst: JoltNinja, DJShy
Someone else: reallytired, thatother1dude, stewyworks333, dayandnight
No one this season: Otakukun (technically, if you don't count Jasper being shattered)

Gems that will be (be revealed to have been) un-bubbled this season:

Other Rose Quartzes: reallytired, TFSyndicate, Otakukun, thatother1dude, rjd1922, stewyworks333, dayandnight, JoltNinja
The Jades: thatother1dude, rjd1922, dayandnight, JoltNinja
The Zircons: thatother1dude, stewyworks333, dayandnight (seen in the movie opening)
Someone else: Otakukun, stewyworks333
None this season:

Fusions that will occur this season:

Opal: Tabs, stewyworks333, Vvv2024
Sugilite: stewyworks333, Vvv2024
Sardonyx: Tabs, reallytired, stewyworks333, Vvv2024
Smoky Quartz: Tabs, reallytired, thatother1dude, stewyworks333, JoltNinja
Rainbow Quartz: Tabs, reallytired, Otakukun, thatother1dude, stewyworks333, dayandnight
Sunstone: Otakukun, thatother1dude, stewyworks333
Steven + Ruby:
Steven + Sapphire:
Steven + Peridot: , Otakukun, stewyworks333, dayandnight, TheOtakuNinja, GoblinCipher
Steven + Lapis: Burstkiller, Otakukun, dayandnight, TheOtakuNinja, Vvv2024
Steven + Opal:
Steven + Sugilite:
Steven + Sardonyx:
Steven + a human that isn't Connie: , Otakukun, DJShy
Steven + any Gem + any human: Burstkiller
Steven + Lion:
Lapis + Peridot: reallytired, Burstkiller, TFSyndicate, Otakukun, stewyworks333, dayandnight, JoltNinja, TheOtakuNinja, Vvv2024
Lapis + Pearl:
Lapis + Amethyst:
Lapis + Garnet:
Malachite: Otakukun
Peridot + Pearl:
Peridot + Garnet:
Peridot + Amethyst: reallytired, JoltNinja
Stevonnie: Tabs, reallytired, Otakukun, stewyworks333, JoltNinja
Alexandrite: Tabs, stewyworks333
Obsidian: Burstkiller, stewyworks333, Vvv2024, GoblinCipher
Something else: Tabs, Otakukun, stewyworks333 (Pearl and Pink Pearl, Eyeball and Aquamarine)
None this season (impossible as it may be):

Characters that will sing this season:

Amethyst: Tabs, Otakukun, thatother1dude, stewyworks333, Vvv2024
Pearl: Tabs, Otakukun, stewyworks333, DJShy, Vvv2024
Steven: Tabs, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja, DJShy, Vvv2024
Connie: Tabs, Otakukun, thatother1dude, stewyworks333, dayandnight, Vvv2024
Ruby: Otakukun, Vvv2024
Sapphire: Otakukun, Vvv2024
Garnet: Tabs, Otakukun, stewyworks333, Vvv2024
Greg: Tabs, Otakukun, thatother1dude, stewyworks333, Vvv2024
Rose: Burstkiller, Vvv2024
Peridot: Tabs, stewyworks333, Vvv2024
Lapis: Tabs, Vvv2024
Jasper: Otakukun, Vvv2024
Bismuth: Otakukun, stewyworks333, Vvv2024
Mystery Girl: stewyworks333
Opal:
Lars: stewyworks333, dayandnight, Vvv2024
Sadie: Tabs, Otakukun, thatother1dude, stewyworks333, dayandnight, Vvv2024
Someone else: Tabs, stewyworks333, DJshy, Vvv2024 (Rainbow Quartz 2.0, Blue Diamond)

Mystery Girl's name is:

Star: stewyworks333
Storm:
Sugar: Vvv2024
Susan:
Selena:
Sheena:
Stella:
Sabina: Burstkiller, DatLonerGirl, dayandnight
Sharon:
Something else:
Won't be revealed this season: Otakukun, Booster137, DJShy, GoblinCipher

Things Ronaldo stated in "Rocknaldo" that will occur or turn out to be true:

The appearance of a Bloodstone: Tabs, reallytired, thatother1dude, stewyworks333, dayandnight, GoblinCipher
An organic creature with a crushed-up Gem coursing through its blood: Tabs, Burstkiller, stewyworks333
Steven considering Connie to be his girlfriend: Tabs, Burstkiller, Otakukun, Lattelawyer, stewyworks333, DJShy, Vvv2024, GoblinCipher
Mind control minerals in the water supply: Tabs
A Gem's pocket dimension being known as a "Mud Dimension": Tabs
None this season:

Inside Lion's chest is:

Some sort of device:
Another bubbled Gem:
A book or other record on the Gem war:
Nothing; the chest is empty:
An additional recording for Steven made in case he learns the truth about Pink Diamond: GoblinCipher
A letter for Steven:
Something completely mundane: reallytired, thatother1dude, stewyworks333, dayandnight, DJShy
Something else: Burstkiller, Otakukun, Lattelawyer
Won't be revealed this season:

Homeworld Gems that will appear this season:

Any member(s) of the Ruby Squad^noteDoc, Eyeball, Navy, Army, Leggy: Tabs, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja (Eyeball)
Any member(s) of the Famethyst: Tabs, reallytired, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja, DJShy
Aquamarine: stewyworks333, dayandnight, JoltNinja
Emerald: stewyworks333, dayandnight, Vvv2024
Holly Blue Agate: dayandnight
Topaz: stewyworks333
Another Ruby not part of the Ruby Squad: reallytired (Nanefua's guards)
Another Sapphire:
A new Pearl (not Blue, Yellow, or Pink): reallytired, Otakukun, stewyworks333, Vvv2024 (Aubergine Pearl)
Another Quartz soldier: Tabs, reallytired, Otakukun, stewyworks333 (Cherry Quartz)
Another Lapis Lazuli: Otakukun, stewyworks333
Another Peridot: Burstkiller, stewyworks333, Vvv2024 , SETUP
Another Bismuth: , Otakukun, Vvv2024
Another Agate: GoblinCipher
Another Aquamarine: Otakukun (one of the extras)
Another Topaz: , Otakukun, Vvv2024
A non-Corrupted version of any Corrupted Gem we've seen: Tabs, Burstkiller, Otakukun, stewyworks333
New Gem types: Tabs, reallytired, Otakukun, thatother1dude, stewyworks333, dayandnight, TheOtakuNinja

Following their arrival to Earth, the Off Colors will stay:

At the Temple:
At Lars' house: Otakukun, stewyworks333, Vvv2024
In Bismuth's Forge:
In the Sun Incinerator: reallytired, DatLonerGirl, dayandnight, JoltNinja, DJshy (they decided to go back to space after a while)
In Pink's leg ship:
Somewhere else: Burstkiller, Booster137 (Little Homeworld, temporarily)

A Gem War will happen:

This season: Burstkiller, Vvv2024
Not this season: Tabs, Otakukun, stewyworks333, dayandnight, DJShy, GoblinCipher

Characters who will learn the truth about Rose Quartz/Pink Diamond:

Lapis: Tabs, reallytired, Otakukun, Lattelawyer, stewyworks333, dayandnight, JoltNinja
Jasper: Tabs, reallytired, Otakukun, thatother1dude, Lattelawyer, stewyworks333, dayandnight, JoltNinja
Any (or every) member of the Ruby Squad^*Leggy, Navy, Doc, Eyeball, Army: Otakukun, stewyworks333, dayandnight, JoltNinja
The Off Colors: Tabs, Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja
Holly Blue Agate/The Famethyst: Otakukun, thatother1dude, stewyworks333, dayandnight, JoltNinja
Aquamarine: stewyworks333, dayandnight, JoltNinja
Topaz: stewyworks333, JoltNinja
Someone else: stewyworks333, JoltNinja
Everyone found out previously or during the Time Skip: TurquoiseOwl

Homeworld was destroyed by:

White Diamond: Burstkiller, DatLonerGirl, JoltNinja
Spinel: BNSF1995
The Sneople:
Another alien race: Otakukun
Excessive Kindergarten production: thatother1dude, rjd1922, stewyworks333, TurquoiseOwl, dayandnight, TheOtakuNinja, GoblinCipher
Pink Diamond (she's just that bad): Vvv2024
Not addressed

The following Gems will be shattered:

Yellow Diamond:
Blue Diamond: Otakukun
White Diamond:
Someone else: Booster137 (Jasper, but she was healed)
Nobody this season: TFSyndicate, thatother1dude, stewyworks333, dayandnight, JoltNinja, Vvv2024

Lapis will live in:

Steven's house: stewyworks333
Existing rooms in the temple:
New rooms in the temple: dayandnight
New house in/near Beach City: thatother1dude, JoltNinja, DJShy (Little Homeworld)
Reinhabitated gem ruins:

Peridot will live in:

Steven's house: stewyworks333
Existing rooms in the temple:
New rooms in the temple: dayandnight
New house in/near Beach City: thatother1dude, JoltNinja, DJShy (Little Homeworld)
Reinhabitated gem ruins:

Bismuth will live in:

Steven's house:
Existing rooms in the temple: DJShy
New rooms in the temple: stewyworks333, dayandnight, JoltNinja
New house in/near Beach City: thatother1dude (Little Homeworld)
Reinhabitated gem ruins:

Jasper will:

Leave Earth as soon as possible:
Settle some things with the Crystal Gems, then leave: thatother1dude, Lattelawyer, stewyworks333, JoltNinja
Stay on Earth indefinitely: dayandnight

Nephrite and her crew will:

Return to Homeworld:
Stay on Earth: thatother1dude, stewyworks333, dayandnight, JoltNinja, DJShy (judging by their appearance in the title sequence),
Nephrite will stay, her crew will leave:

Most of the other formerly corrupted Homeworld Gems will:

Return to Homeworld:
Stay on Earth: thatother1dude, stewyworks333, dayandnight, GoblinCipher
Not addressed (though some of the cured gems were may have been Homeworld loyalists)

Most of the formerly corrupted Crystal Gems will stay:

At the abandoned gem sites: thatother1dude, stewyworks333
In Beach City: dayandnight
Elsewhere among humans: (they're shown to intermingle with humans in Beach City even if they don't live there)
Elsewhere in previously uninhabited territory: (Little Homeworld, established over the land that was previously the barn)

The Zoo will:

Be relocated onto Earth: thatother1dude, stewyworks333, dayandnight (but only temporarily)
Have its inhabitants (humans and gem) relocated:
Nothing this season:
Roam the universe at the Zoomans' discretion

Most of the Famethyst will:

Continue to work for Homeworld elsewhere:
Move to Earth with the Crystal Gems:
Stay with the Zoomans: thatother1dude, stewyworks333, dayandnight, JoltNinja
Nothing this season:

The real Rose Quartzes will:

Resume working for Homeworld: dayandnight, JoltNinja
Move to Earth: stewyworks333
Form their own faction and declare war on Steven and the Diamonds: BNSF1995
Other (Stay on the Zoo ship)
Nothing this season:

Morganite will:

Accept the new changes made on Homeworld since the start of Era 3, and perhaps even reconcile with Rhodonite:
Disapprove of the new changes made on Homeworld since the start of Era 3:
She won't appear this season: GoblinCipher, JoltNinja

Special guest voices:

Justin Roiland: TFSyndicate
"Weird Al" Yankovic: TFSyndicate
Jemaine Clement: TFSyndicate
Stephen Colbert: TFSyndicate
Mark Hamill: TFSyndicate GoblinCipher
Lin-Manuel Miranda: TheOtakuNinja
Philippa Soo: TheOtakuNinja
Idina Menzel: TheOtakuNinja

The giant horned red creature in the opening is:

A non-Gem alien: thatother1dude
A still-corrupted Gem:
A newly corrupted Gem (not Steven):
A corrupted Steven: TheOtakuNinja, JoltNinja (although it's debatable if he's technically corrupted)
A corrupted Steven, but only the Gem half: Booster137
A corrupted Spinel: rjd1922
Connected to Steven in some way (not corrupted): lupinequeen13
A Gem that chose a non-humanoid form:
A creature made by Gem abilities:
Black Diamond: SETUP
Steven's darker aspect, existing in the landscape of his own mind: Jyger85

The gem in the opening that looks like a pink-shaded White Diamond is:

Another version of Pink Diamond that White Diamond tried to make:
White Diamond losing control of her powers: thatother1dude, Booster137, rjd1922
Just White Diamond, but angry:
White Diamond possessed by Steven: (though voluntarily)
Steven taken over by Pink energy: GoblinCipher

The very last scene of the series will take place:

In the same time frame Future starts in: thatother1dude, rjd1922
Several years later: JoltNinja
Over a decade later:
Hundreds or thousands of years in the future: GoblinCipher

Things we'll discover happened during the timeskip:

Sadie and Lars start openly dating:
Steven and Connie start openly dating:
The Zoomans move out of the Zoo:
None of the above:

Connie's parents find out about Stevonnie:

They already have: GoblinCipher, JoltNinja
During the season: thatother1dude
During an epilogue:
Not addressed

The Cactus Steven is hostile because:

It's trying to protect Steven like the Watermelon Stevens did at first:
Steven did something to turn it against him: thatother1dude (Steven abused it and it went berserk out of anger)
It's just hostile by nature: Booster137, JoltNinja
It's a manifestation of Steven's inner turmoil: JoltNinja (Sort of, Steven dumped his inner turmoil onto the cactus, making it get angry at Steven)
Someone else made it with Steven's spit or extracts from the chamber: GoblinCipher
It isn't hostile and the appearance in the opening is a red herring:

Steven will lose an eye:

Yes: JoltNinja
Yes, but it gets healed:
No: BNSF1995

The Sneople will turn out to be real:

Yes, because Ronaldo was right about the Great Diamond Authority: BNSF1995
No, because Ronaldo is crazy: JoltNinja
No, because it wouldn't make sense for the narrative: JoltNinja, rjd1922

Steven's living situation by the end of Future:

He stays in Beach City:
He moves out:
He moves out for at least several months, but eventually moves back: thatother1dude

Steven will be corrupted...:

...by his turmoil:
...by someone messing with his mind:
...by someone messing with his body:
...by someone messing with his mind and body:
...not at all:

Save the Light

The remaining party members are:

Peridot: Yoyomom, Mango-Pango, thatother1dude
Lapis: Yoyomom, Mango-Pango, thatother1dude, Crossover-Enthusiast
Bismuth (as a secret character): Cavery210
A new character:

The suspected Homeworld Gem mentioned to have stolen the Light in the preview is:

Lapis or Peridot:
Another member of the Ruby Squad that crashed on Earth:
Aquamarine or Topaz:
A Gem original to the game: nightelf37, Mango-Pango, stewyworks333 (Hessonite, kind of)
A Corrupted Gem or Gem Mutant:
A human: nightelf37
Not a Gem or a human: thatother1dude

WMG / Steven Universe — Betting Pool

Edit Locked

Once the Crystal Gems are done staying at the barn, Peridot will move into...

Gem Corruption is caused by:

Peridot's first Fusion will be with:

The Diamonds (re-)appearing include:

Lion is:

Peridot's Gem Weapon is:

Pearl belonged to:

The opening sequence will change:

Peridot will be poofed and get a Crystal Gem redesign:

By the end of the season, Lapis's relation to the Crystal Gems as a whole will be:

More Homeworld Gems will come to Earth:

We will see more Crystal Gems:

Lapis was in the mirror because:

Steven's first Gem Fusion will be with:

Peridot's star will be:

By the end of the season, Jasper will be:

Centipeetle is a(n):

Centipeetle's alignment was:

Smoky Quartz is:

By the end of the season, Bismuth will be:

Gems that will be poofed (but not necessarily remain in their gems) this season:

"Here Comes a Thought" will be sung by:

Peridot's first Fusion will be with:

The Diamonds (re-)appearing include:

Lion is:

Pearl belonged to:

The opening sequence will change:

Peridot will be poofed and get a Crystal Gem redesign:

Peridot's star will be:

More Homeworld Gems will come to Earth:

Jasper will be uncorrupted:

Centipeetle will be uncorrupted:

Centipeetle is a(n):

Gems that will be poofed this season:

"Here Comes a Thought" will be sung by:

Gems that will be un-bubbled this season:

Fusions that will occur this season:

Characters that will sing this season:

Mystery Girl's name is:

If Lapis joins the Crystal Gems, her star will be:

White Diamond has no known followers, and was never discussed by Yellow or Blue, because:

New instruments/genres to be used for new characters:

Things Ronaldo stated in "Rocknaldo" that will occur or turn out to be true:

Inside Lion's chest is:

The smaller Gem in the promo is:

Episode 1 of Season 5 will take place...

Peridot's first Fusion will be with:

The Diamonds (re-)appearing include:

Lion is:

Pearl belonged to:

The opening sequence will change:

Peridot will be poofed and get a Crystal Gem redesign:

Peridot's star will be:

Jasper will be uncorrupted:

Centipeetle will be uncorrupted:

Centipeetle is a(n):

Gems that will be poofed this season:

Gems that will be un-bubbled this season:

Fusions that will occur this season:

Characters that will sing this season:

Mystery Girl's name is:

If Lapis joins the Crystal Gems, her star will be:

White Diamond has no known followers, and was never discussed by Yellow or Blue in "That Will Be All", because:

Things Ronaldo stated in "Rocknaldo" that will occur or turn out to be true:

Inside Lion's chest is:

The ruins in "Lion 4" are:

White Diamond will be revealed:

Ashly Burch is voicing:

The new Gem in the Wanted promo is a(n):

Homeworld Gems that will appear this season:

How the Crystal Gems will rescue Steven and Lars from Homeworld:

Pink Diamond was really shattered by:

Following their arrival to Earth, the Off Colors will stay:

A Gem War will happen:

The structure in Homeworld that resembles White Diamond is:

Lapis will betray the Crystal Gems and side with Homeworld:

"Escapism" will be sung by:

The winner of Beach City's mayoral election will be: