You vote for the one who you like more, not who's the strongest one in a fight and have fun:
Moondragon vs. Avalanche
Sin vs. Drax the Destroyer
Ms. America (America Chavez) vs. Batroc the Leaper
Madame Masque vs. Gamora
Thanos vs. Negasonic Teenage Warhead
Toad vs. Franklin Richards
Speedball (Robbie Baldwin) vs. M.O.D.O.K.
The Hypno-Hustler vs. Jessica Jones
Karnak vs. The Puppet Master
Omega Red (Arkady Rossovich) vs. Rictor
Madelyne Pryor vs. Karolina Dean
Venom (Eddie Brock) vs. Ant-Man (Scott Lang)
Empath vs. Boom-Boom
Shuri vs. The Living Monolith
Howard the Duck vs. Scalphunter
Warlord Krang vs. Quasar (Wendell Vaughn)
Sam Wilson vs. Mr. Hyde
Mystique vs. Wallflower
The Grandmaster vs. Vindicator (Heather Hudson)
Sunfire vs. Trevor Fitzroy
The Shocker (Herman Schultz) vs. Nico Minoru
Rescue (Pepper Potts) vs. Hypnotia
Balder the Brave vs. Maximus the Mad
Moonstone (Karla Sofen) vs. Amanda Sefton
Phyla-Vell vs. Chance (Nicholas Powell)
Thunderbird (John Proudstar) vs. Arcade
Darkstar (Laynia Petrovina) vs. Ronan the Accuser
Noh-Varr vs. Bison
Meggan Braddock vs. Flag-Smasher (Karl Morgenthau)
Dr. Octopus (Otto Octavius) vs. Gentle
Manifold vs. Goldbug (Matthew Gilden)
Ka-Zar (Kevin Plunder) vs. Arclight
Kraven the Hunter (Sergei Kravinoff) vs. Molly Hayes
Jetstream vs. Chamber (Jonothon Starsmore)
Abigail Brand vs. Baron Zemo (Helmut)
Sabra vs. Gladiator (Kallark)
Tarot vs. Shatterstar
Taskmaster vs. Chase Stein
Groot vs. Blockbuster (Michael Baer)
Roulette vs. Snowbird
Ms. Marvel (Kamala Khan) vs. Scrambler
White Tiger (Ava Ayala) vs. Morbius
Catseye vs. Forge
Triton vs. Riptide
Lilandra vs. Stilt-Man (Wilbur Day)
Star-Lord (Peter Quill) vs. Vertigo (Marauder)
Pixie (Megan Gwynn) vs. Sauron
Green Goblin (Norman Osborn) vs. Victor Mancha
D-Man (Dennis Dunphy) vs. Mongoose
Ultron vs. Petra
Rocket Raccoon vs. Harpoon
Starfox vs. Razorback (Buford Hollis)
Darkhawk (Chris Powell) vs. Prism
Sabretooth vs. Hellion (Julian Keller)
Spifire (Jacqueline Falsworth) vs. The Lizard
Strong Guy vs. Arnim Zola
Wolfsbane vs. Armadillo
Warlock (Technarchy) vs. Electro (Max Dillon)
Titanium Man (Boris Bullski) vs. Skaar
Guardian (James Hudson, Jr.) vs. Sandman
Big Wheel vs. Spider-Girl (Anya Corazon)
Uatu the Watcher vs. Bullseye
Taserface vs. Maggott
Colleen Wing vs. Pyro