Steam Smash Showdown

Steam Smash Showdown is a crossover fighting game that is made exclusively for Steam

Undertale

 * Frisk (starter)
 * Chara (unlockable)
 * Toriel (starter)
 * Asgore (unlockable)
 * Undyne (starter)
 * Papyrus (starter)
 * Sans (unlockable)
 * Asriel Dreemurr (unlockable)
 * Muffet (assist)
 * Mettaton (assist)
 * W. D. Gaster (assist)
 * Temmie (assist)
 * Madjick (assist)
 * Annoying Dog (assist)
 * Flowey (assist)

Team Fortress

 * Heavy (starter)
 * Scout (starter)
 * Spy (starter)
 * Soldier (starter)
 * Sniper (starter)
 * Pyro (starter)
 * Demoman (starter)
 * Medic (starter)
 * Engineer (starter)

Half-Life

 * Gordon Freeman (starter)

Portal

 * Chell (starter)

Blazblue

 * Ragna the Bloodedge (starter)
 * Noel Vermillion (starter)
 * Jin Kisaragi (starter)
 * Iron Tager (starter)
 * Rachel Alucard (unlockable)
 * Taokaka (unlockable)
 * Bang Shishigami (unlockable)
 * Hakumen (unlockable)
 * Nu-13 (assist)
 * Arakune (assist)
 * Litchi Faye-Ling (DLC)
 * Tsubaki Yayoi (DLC)
 * Makoto Nanaya (DLC)
 * Hazama (DLC)

Skullgirls

 * Filia (starter)
 * Cerebella (starter)
 * Peacock (starter)
 * Valentine (assist)
 * Painwheel (unlockable)
 * Squigly (unlockable)
 * Beowulf (unlockable)
 * Big Band (assist)
 * Robo-Fortune (assist)
 * Bloody Marie (assist)
 * Ms. Fortune (DLC)
 * Fukua (DLC)
 * Eliza (DLC)
 * Parasoul (DLC)

Arcana Heart

 * Heart Aino (starter)
 * Saki Tsuzura (unlockable)
 * Kamui Tokinomiya (unlockable)
 * Petra Johanna Lagerkvist (starter)
 * Akane Inuwaka (starter)
 * Nazuna Inuwaka (unlockable)
 * Weiss (starter)
 * Parace L'Sia (assist)
 * Mildred Avallone (assist)
 * Minori Amanohara (unlockable)
 * Konoha (DLC)
 * Zenia Valov (DLC)
 * Fiona Mayfield (DLC)
 * Scharlachrot (DLC)

Guily Gear

 * Sol Badguy (starter)
 * Ky Kiske (starter)
 * May (unlockable)
 * Jam Kuradoberi (unlockable)
 * Faust (starter)
 * Millia Rage (starter)
 * Potemkin (starter)
 * Sin Kiske (unlockable)
 * Leo Whitefang (unlockable)
 * Venom (assist)
 * Bedman (DLC)
 * Chipp Zanuff (DLC)
 * Axl Low (DLC)
 * Dizzy (DLC)

Injustice: Gods Among Us

 * Batman (starter)
 * Superman (unlockable)
 * The Flash (starter)
 * Wonder Woman (starter)
 * Green Lantern (starter)
 * Aquaman (starter)
 * Cyborg (starter)
 * Nightwing (starter)
 * Shazam (starter)
 * Hawkgirl (assist)
 * The Joker (unlockable)
 * Harley Quinn (unlockable)
 * Catwoman (unlockable)
 * Lex Luthor (assist)
 * Raven (assist)
 * Killer Frost (assist)
 * Green Arrow (assist)
 * Deathstroke (unlockable)
 * Black Adam (unlockable)
 * Doomsday (assist)
 * Bane (assist)
 * Ares (assist)
 * Solomon Grundy (assist)
 * Zatanna (assist)
 * Martain Manhunter (DLC)
 * Zod (DLC)
 * Batgirl (DLC)
 * Lobo (DLC)

Mortal Kombat

 * Liu Kang (starter)
 * Kung Lao (starter)
 * Scorpion (starter)
 * Sub-Zero (starter)
 * Raiden (unlockable)
 * Cassie Cage (starter)
 * Johnny Cage (unlockable)
 * Jacqui Briggs (starter)
 * Jax (unlockable)
 * Sonya Blade (starter)
 * Goro (assist)
 * Erron Black (assist)
 * Shao Kahn (unlockable)
 * Shang Tsung (DLC)
 * Nightwolf (DLC)
 * Smoke (DLC)
 * Tremor (DLC)

Alice: Madness Returns

 * Alice Liddel (unlockable)

Minecraft

 * Steve (starter)
 * Alex (unlockable)
 * Jesse (unlockable)
 * Creeper (assist)
 * Villager (assist)
 * Witch (assist)

Five Nights at Freddy's

 * Freddy Fazbear (starter)
 * Bonnie (unlockable)
 * Chica (assist)
 * Foxy (assist)
 * Mangle (assist)
 * Springtrap (unlockable)
 * Golden Freddy (assist)
 * Balloon Boy (assist)
 * Marionette (assist)

Street Fighter

 * Ryu (starter)
 * Ken Masters (unlockable)
 * Chun-Li (starter)
 * Sakura (unlockable)
 * Akuma (unlockable)
 * Dhalsim (assist)
 * Dan Hibiki (assist)
 * Blanka (assist)
 * Guile (DLC)
 * Ibuki (DLC)
 * Zangief (DLC)
 * M. Bison (DLC)

Gunhound EX

 * Juliane Yuri (starter)
 * Jason 'KID' Powell (unlockable)

Shank

 * Shank (starter)
 * Corina (starter)
 * Falcone (unlockable)
 * Angelo (assist)
 * Cesar (unlockable)
 * Inferno (assist)

Mark of the Ninja

 * Ninja (starter)
 * Ora (unlockable)
 * Dosan (DLC)

Terraria

 * The Player (starter)

Astebreed

 * Roy Becket (starter)
 * Fiona Nono (starter)
 * Estina Nono (unlockable)

Overwatch

 * Tracer (starter)
 * Winston (starter)
 * Soldier: 78 (starter)
 * Reaper (assist)
 * Mercy (assist)
 * Zenyatta (assist)
 * Bastion (assist)
 * Phara (unlockable)
 * Reinhardt (unlockable)
 * D.Va (unlockable)
 * Hanzo (unlockable)
 * Genji (unlockable)
 * Mei (DLC)

The Binding of Issac

 * Issac (unlockable)

Delicious

 * Emily (assist)

Shovel Knight

 * Shovel Knight (starter)
 * Shield Knight (starter)
 * Black Knight (unlockable)
 * Plague Knight (assist)

Super Meat Boy

 * Meat Boy (starter)
 * Banage Girl (unlockable)
 * Dr. Fetus (unlockable)

Bosses

 * Ragnarok (from Arcana Heart 3)
 * That Man (from Guily Gear 2: Overture)
 * Gigant: Take-Mikazuchi (from Blazblue: Chronophantasma)
 * Corrupted Shinnok (from Mortal Kombat X)
 * The Dollmaker (from Alice: Madness Returns)
 * Ender Dragon (from Minecraft)
 * Toro (from Shank)
 * Glados (from Portal)
 * Final Boss: Photoshop Flowey (from Undertale)