You vote for the one who you like more, not's who's the strongest one in a fight and have fun:
Black Knight (Dane Whitman) vs. Jocasta
Domino (Neena Thurman) vs. The Red Hulk
Sunfire vs. Count Nefaria
Mantis vs. Black Mamba
Spiral vs. Black Panther (Shuri)
Blade vs. Longshot
Spider-Man (Miles Morales) vs. Anaconda
Elektra vs. The Asp
Odin vs. Volstagg
Hammerhead vs. Karnak
Ms. Marvel (Kamala Khan) vs. Brother Voodoo
Quicksilver vs. Bulldozer (Henry Camp)
M.O.D.O.K. vs. Quake (Daisy Johnson)
Darkhawk (Chris Powell) vs. Puff Adder
White Tiger (Ava Ayala) vs. Blue Streak (Jonathan Swift)
Forge vs. The Shroud
Doc Samson vs. Cottonmouth (Burchell Clemens)
Groot vs. Abigail Brand
The Man-Thing vs. Elixir
Bishop (Lucas) vs. The Rattler
Firestar vs. Thunderball
Spider-Girl (Anya Corazon) vs. Princess Python (Zelda DuBois)
X-23 vs. Hydro-Man (Morrie Bench)
Warpath (James Proudstar) vs. Dagger
Doop vs. The Impossible Man
Wonder Man vs. Blastaar
Angel (Warren Worthington III) vs. Carnage
Gargoyle (Isaac Christians) vs. Diamondback (Rachel Leighton)
Rocket Raccoon vs. Speedball (Robbie Baldwin)
Tigra vs. Piledriver
Ronan the Accuser vs. Triton
Gamora vs. Sersi
Green Goblin (Norman Osborn) vs. Cloak
Agent Venom vs. Sidewinder (Gregory Bryan)
Sif vs. Hogun the Grim
Gambit vs. D.K. (Georgia Dakei)
Nova (Richard Rider) vs. The Wrecker (Dirk Garthwaite)
Squirrel Girl vs. Forbush Man
Ghost Rider (Johnny Blaze) vs. Whiplash (Anton Vanko)
Skaar vs. Bushmaster (Quincy McIver)
Sabretooth vs. Balder the Brave
Hercules vs. Corsair (Christopher Summers)
Starfox vs. The Purple Woman
Banshee vs. Meggan Braddock
Julia Carpenter vs. The Mandarin
U.S. Agent vs. Cobra (Piet Voorhees)
Quasar (Wendell Vaughn) vs. Frog-Man
Adam Warlock vs. Swordsman (Jacques Duquesne)
Ego the Living Planet vs. Lockjaw
Luke Cage vs. Plunderer (Edgar Plunder)
Toad vs. Medusa
Drax the Destroyer vs. Arnim Zola
Yondu vs. Sage
War Machine (James Rhodes) vs. The Molecule Man
The Abomination vs. Ka-Zar (Kevin Plunder)
Amora the Enchantress vs. Sabra
M (Monet St. Croix) vs. The Human Torch (Jim Hammond)
Galactus vs. Night Trasher (Dwayne Taylor)
Dragon Man vs. Gorgon
Captain America (Sam Wilson) vs. The Mole Man
Madame Masque vs. Fandral the Dashing
Angela vs. Death Adder (Theodore Scott)
The Collector vs. Jack of Hearts
Ant-Man (Scott Lang) vs. Stingray