Who are some Marvel Heroes partners/sidekicks?
Right now I know:

Captain America-Falcon

thats it

Cage and Iron Fist
Spidey and Black Cat

Captain America and Bucky. There were a few incarnations of that pairing.

George and Gracie

Wolvie and every underaged female teen mutant.

Ant man and Wasp

Vision and Scarlett Witch

The (Original) Human Torch and Toro

The Punisher and Guns

Nick Fury and Dum-Dum Dugan

and those are just the good guys

Haha, I just noticed that. O and Cloak and Dagger. Maybe Venom and Carnage/Venom and Spidey.

Daredevil and Black Widow
Silver Sable and Sandman
Spidey and just about anyone
Thing and just about anyone
Cable and Deadpool

that's all off top of my head

This message must include text by me that was not added into the quote.

####, I thought this was Clix General Discussion, sorry, ignore me.

don't be such a commie

it's ok, somedays, one is never sure if they're Lenin or Stalin or, even, Trotsky. It happens.

How about
Hawkeye and Black Widow?
Magneto and Mystique?
Galactus and Silver Surfer?

Wonder Man & Beast
Jessica Jones & Luke Cage
Captain Britain & Meggan
Havok & Polaris
Quicksilver & Scarlet Witch
Storm & Yukio
Warlock & Cypher
Ka-Zar & Zabu
Cable & Domino

Hawkeye and Mockingbird

Dr Strange and Clea

Dormammu and Ummar

Johnny Blaze and Zarathos

Rick Jones and (just about) anyone using "Captain" in their code-name

Fixer and Mentallo
Baron Zemo and Techno
Captain America and Bucky
Andrea and Andreas Strucker (Fenris)
Sandman and Hydro-Man
ROM and Starshine

Juggernaut and Black Tom (sounds like an adult movie tittle)

Viper and the Silver Samurai

Daredevil and Elektra

Constrictor and Sabretooth

Absorbing Man and Titania

Dazzler and Longshot

Storm and Forge

Mystique and Destiny

Colleen Wing and Misty Knight

Jean Grey and Cyclops

Shadowcat and Colossus

Wolverine and Kitty Pryde

Molecule Man and Volcana

To name a few...