ANGEL SETS: 

SA Shirt: Eyebulb
SA Pants:Bully Behemoth
SA Shoes: Fusionfly

AA Shirt: Jurassic Centurion
AA Pants: Scoria Cephalopod, Doom Strider
AA Shoes: Eyebore, Slag Cephalopod, Shellslug

RA Shirt: Cyberus Zero
RA Pants:  Demolition Bear
RA Shoes: Doom Digger

Starblade set

Stellar Blade: Lizard Queen
Stardust Blade: Hyper Fusionfly
Galactic Blade: Meteoric Sentry
Interstellar Blade: Slag Cephalopod
Intergalactic Blade: Shellslug


Apples

Apple of Discord: Triceraclaws
Pewter Apple of Discord: Stone Drake
Brass Apple of Discord: Bully Behemoth
Custom Apple of Discord: Great Eyebulb
Dark Apple of Discord: Meteoric Guardian and/or Doom Strider


Omega set

Omega Gun: Triceraclaws & Fossil Crawlers & Fossil Brawlers
Omega Grunt: Freakosaurus Rex in Fusion Ed's Lair & Father Freakosaurus
Omega Outlaw: Dark Fusionfly
Omega Cutthrooat: Great Shellworm
Omega Roughneck: Meteoric Guardian


Rifle set

Style Rifle: Triceraclaw
Hipster Rifle: Lizard King & Miasma Hulk
Glamour Rifle: Bully Behemoth
Fashion Rifle: Great Eyebulb & Jurassic Centurion
Couture Rifle: Scoria Cephalopod


Scorpion set

Scorpion Ranger: Horrordactyl
Scorpion Stinger: Tootie & Father Freakosaurus
Scorpion Slayer: ???
Scorpion Striker: ???
Scorpion Predator: Lord Fuse


Cutlass set

Space Cutlass: Terrordactyl
Rocket Cutlass: Tootie
Asteroid Cutlass: Dark Fusionfly
Orbital Cutlass: Jurassic Centurion
Infinity Cutlass: Great Shellslug/Great Eyebore


Bio-Plasma Cannons

Bio-Plasma Cannon: Fossil Brawlers
Heavy Bio-Plasma Cannon: Father Freakosaurus
Reinforced Bio-Plasma Cannon: Ghastly Growth & Bully Behemoth
Tactical Bio-Plasma Cannon: Great Shellworm
Massive Bio-Plasma Cannon: Great Shellslug/Great Eyebore


Fuse stuff

Fuse Jammer: Volcano Toad
Fuse Disruptor: Creeposaurus Rex
Fuse Dissipater: Skull Basher
Fuse Decomposer: Mission CRATE/Meteoric Sentry
Fuse Disintegator: Slag Cephalopod


Leviathans

Leviathan: Volcano Vaulter
Bullhead Leviathan: Creeposaurus Rex
Sandtiger Leviathan: Skull Basher
Hammerhead Leviathan: Eyebulb
Great White Leviathan: Eyebore


Engine Series

Atomic Engine: Sickle Simian
Electro Engine: Magma Hulk
Neutrino Engine: Fusionfly
Proto Engine: Shellworm
Quark Engine: Slag Cephalopod


Val Hallen set

Val Hallen's Guitar: Boardwalk Bully & Boardwalk Brawler
Val Hallen's Axe: Granite Grabber & Arch Welder
Val Hallen's Six-String: Timber Creeper
Val Hallen's Shredder: Aubergine Master
Val Hallen's Hammer: Grime Serpent & Brackish Beast

Shield sets

Giga Shield Shirt: Meteoric Guardian
Giga Shield Pants: Slag Cephalopod
Giga Shield Boots: Great Shellworm
Hyper Shield Helmet: Darklands EGG
Hyper Shield Shirt: ???
Hyper Shield Pants: Jurassic Centurion
Hyper Shield Boots: Eyebulb & Meteoric Sentry
Cyber Shield Helmet: Darklands EGG
Cyber Shield Shirt: Bully Behemoth
Cyber Shield Pants: Wooly Behemoth/Fusionfly
Cyber Shield Boots: Stone Drake
Mecha Shield Helmet: Fowl Freak & Wilds EGG
Mecha Shield Shirt: Triceraclaw
Mecha Shield Pants: Scythe Simian
Mecha Shield Boots: Fowl Freak


Jungle Items

Leopard Shirt: Eyebulb
Leopard Pants: ???
Leopard Boots: Fusionfly
Jungle Shirt: Scoria Cephalopod
Jungle Pants: Eyebore
Jungle Boots: Great Shellworm

Ben 10 Items

Brainstorm Shock Cannon: Boardwalk Bully
Ben 10 Jacket: Meteoric Guardians
CB Armor: Jurassic Centurion
CB Leggings: Meteoric Guardian & Lord Fuse
CB Combat Boots: Slag Cephalopod & Eyebore
Stinkfly Stinkbomb: Eyebulb
Hex Staff: Killowatts
Swapfire Torch: Dire Ape & Razor Mantis
Wildvine Seedbomb: Meteoric Guardian or fuse

Lowlander Tunic: Stone Drake and Father Freakosaurus
Lowlander Pants: Lizard Queen
Lowlander Boots: Fossil Crawler
Edinburgh Tunic: Shellworm
Edinburgh Pants: Ghastly Growth
Edinburgh Boots: fusionfly

Dragon Blades

Great Dragon Blade: Creeper King
Ancient Dragon Blade: Horror King
Quartz Dragon Blade: Putrid Spawn
Sun Dragon Blade: Jumbo Fowl Fiend
Jade Dragon Blade: Mission Reward


Tech sets

Tech Camo Shirt: Eyebulb
Tech Camo Pants: Ghastly Growth & Dark Fusionfly
Tech Camo Boots: Fusionfly
Tech Tactical Shirt: Great Shellslug
Tech Tactical Pants: Shellslug
Tech Tactical Boots: Great Eyebulb & Great Shellworm
Tech Saboteur Shirt: Necromasher
Tech Saboteur Pants: Creeper King
Tech Saboteur Boots: Squish Scaler
Tech Spy Shirt: Fowl Foe, Aubergine Master, Galaxy Gardens race 1st rank CRATE
Tech Spy Pants: ???, Galaxy Gardens race 1st rank CRATE
Tech Spy Boots: Timber Creeper, Galaxy Gardens race 1st rank CRATE
Tech Flight Shirt: Cryptworm
Tech Flight Pants: Brackish Beast
Tech Flight Boots: Hydraulic Enforcer


Circuit sets

Parallel Circuit Shirt: Scribble Spawn, Timber Terror
Parallel Circuit Pants: Motorilla, Ramcycle & Rudy
Parallel Circuit Shoes: Wild Skeeter, Weird Welder & Lazy Metal Boy Scout
Closed Circuit Set: Final Thromnambular mission
Open Circuit Shirt: Scoria Cephalopod & Great Shellslug
Open Circuit Pants: Eyebore
Open Circuit Shoes: Great Shellworm


S.H.A.V.E.R.A.M.A.(Shoots Heckuv Alotta Very Electric Razors And Multiple Armaments)s

SHAVERAMA: Cootie & Cavern Wolf
Sensitive SHAVERAMA: Spawn Simian
Moisturizing SHAVERAMA: Mech Queen
Triple-Action SHAVERAMA: Judy
Super Smooth SHAVERAMA: Great Terrorpin & Moussaka Meanie

Information is from fusionfallcentral.com