The Assist Trophy is an item introduced in Super Smash Bros. Brawl. that, when grabbed, summons a random Nintendo or Third-party character to quickly aid the holder. Assist Trophies work nearly identically to Pokéballs, but unlike them, they cannot summon a Pokémon and can be eaten by King Dedede's Neutral B or Munchlax.
Andross
Ashley
Chain Chomp
Color-TV Game 15
Dark Samus
Devil
Dillon
Dr. Kawashima
Dr. Wright
Elec Man
Ghosts
Hammer Bro.
Infantry & Tanks
Isabelle
Jeff Andonuts
Kat & Ana
Knuckle Joe
Lakitu & Spinies
Lyn
Magnus
Metroid
Mother Brain
Nightmare
Nintendog
Phosphora
Riki
Sablé Prince
Saki Amamiya
Samurai Goroh
Sheriff
Skull Kid
Starfy
Starman (Earthbound)
Takamaru
Tingle
Barbara
Excitebiker
Grey Fox
Helirin
Jill & Drill Dozer
Mr. Resetti
Ray MK III
Nabbit
Bald Bull
Karate Joe
Swooping Snitchbug
Yellow Wollywog
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Drake Redcrest
Buck
Carla, Tiago & Bia
Gabi
Mr. Ping
Frieza
Donald Duck
Dumbo
Adeleine
Q*Bert
Mallow
Fi
Groose
Saria
Daroach
Eggplant Wizard
Nurse Joy
Bio Rex
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Sothe
Burrowing Snagret
Ivan
Muddy Mole
Inkling
Silver the Hedgehog
Ylvis
Woody Woodpecker
Mr. Crocker
Farmer with Shotgun
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Future Trunks
Chip & Dale
Eeyore
Maleficent
Minnie Mouse
Quasimodo
Simba
The Beast
Harlem Shaker
Sanjay & Craig
Iron Giant
Coco Bandicoot
Dougal Flopguy
Inuyasha
The Beatles
Wile E. Coyote & Road Runner
Yosemite Sam
Wimpy
The Flying Dutchman
Duffman
Kuma
Thing
Thomas the Tank Engine
Retarded Running Horse
Noo-Noo
Flying Spaghetti Monster
Moogle
Commander Peepers
Lord Business
Sentinel