You vote for the one who you like more, not who's the strongest one in a fight and have fun:
Killer Croc vs. Shadow Lass
Detective Chimp vs. Orca
Lilith Clay vs. Mad Harriet
Amethyst vs. Kanjar Ro
Damage vs. Hector Hammond
Bette Kane vs. Circe
Azrael (Jean-Paul Valley) vs. Metallo
Green Lantern (Mogo) vs. Dr. Polaris (Neal Emerson)
Zachary Zatara vs. Red Lantern (Dex-Starr)
Dolphin vs. Count Vertigo
Lobo vs. Doomsday
Congorilla vs. Roulette (Veronica Sinclair)
Black Orchid (Alba Garcia) vs. Mammoth
General Zod vs. XS
Geo-Force vs. Reactron
Ares vs. Ultra Boy
Wonder Girl (Cassandra Sandsmark) vs. Parasite (Rudy Jones)
S.T.R.I.P.E. vs. Wotan
Frankenstein vs. Shimmer
Nightshade vs. Jinx
Jericho vs. King Shark
Chameleon Boy vs. Roxy Rocket
The Atom (Al Pratt) vs. Mongul I
Firehawk (Lorraine Reilly) vs. The Shark (Karshon)
Desaad vs. Vibe
The Shade (Richard Swift) vs. Apollo (Andrew Pulaski)
Power Girl (Tanya Spears) vs. Abra Kadabra
The Floronic Man vs. Icon
Ms. Martian vs. The Trickster (James Jesse)
The Peacemaker (Christopher Smith) vs. Weather Wizard
Ambush Bug vs. Crazy Quilt (Paul Dekker)
Hourman (Rick Tyler) vs. Psimon
Triumph vs. Giganta
Despero vs. Sun Boy
Dr. Light (Kimiyo Hoshi) vs. Amazo
Crimson Fox (D'Amaris twins) vs. Monsieur Mallah
Rip Hunter vs. Indigo (Brainiac 8)
Rocket Red (Dmitri Pushkin) vs. Hush
Hitman vs. The Brain
Citizen Steel (Nathan Heywood) vs. Mordru
Firestorm (Raymond & Rusch) vs. Mr. Mxyzptlk
Starman (Mikaal Tomas) vs. The Key II
Speedy (Mia Dearden) vs. The Toyman (Winslow Schott)
Bizarro vs. Ferro Lad
Halo vs. Klarion the Witch Boy
Green Lantern (Simon Baz) vs. Stompa
Black Condor (Ryan Kendall) vs. Steppenwolf
Green Lantern (Salaak) vs. Maxie Zeus
Cyclone (Maxine Hunkel) vs. Per Degaton
B'wana Beast vs. Firefly (Garfield Lynns)
Bulleteer (Alix Harrower) vs. Mantis
Blue Beetle (Jaime Reyes) vs. Gizmo (Mikron O'Jeneus)
Silver Sorceress vs. Emerald Empress
Aqualad (Kaldur'ahm) vs. Black Mask (Roman Sionis)
Sgt. Rock vs. Kanto
Bart Allen vs. Lady Shiva
Amazing Man (Will Everett III) vs. Silver Banshee
The Atom (Ryan Choi) vs. Lashina
Malcolm Duncan vs. Queen Bee (Zazzala)
The Shining Knight (Sir Justin) vs. Granny Goodness
Vigilante (Adrian Chase) vs. Kalibak
Static vs. Hugo Strange
O.M.A.C. (Buddy Blank) vs. Shrapnel
The Mad Hatter (Jervis Tetch) vs. Shrinking Violet