Combatants' Home Series

Most of the Death Battle combatants are taken from their own home series to be pitted against other combatants (The only exceptions however who are not listed are Justin Bieber and Rebecca Black, because they are real life people), They are listed by the following series in Death Battle episode order (Note: the characters with bold letters in their name are the Death Battle Winners, and this symbol: "*" means that the character has won twice, those that are Italic mean that the combatant has fought twice or more, and those who have two "*"s are characters with undecided fates (have been confirmed for Death Battle but their episode has not been released)):

Combatants by Series
Star Wars: Boba Fett, Luke Skywalker

Metroid: Samus Aran

Street Fighter: Akuma, Zangief, Chun-Li, Blanka, M. Bison

Mortal Kombat: Shang Tsung, Raiden, Shao Kahn, Sektor

Marvel Comics: Rogue, Thor, Spiderman

DC Comics: Wonder Woman, Batman, Superman

Super Mario (including Donkey Kong Country, Yoshi's Island, & WarioLand/WarioWare): Goomba, Koopa Troopa, Yoshi, Mario, Princess Peach, Luigi

Final Fight: Mike Haggar

Teenage Mutant Ninja Turtles: Leonardo*, Donatello, Michelangelo, Raphael

BattleToads: Zitz

Killer Instinct: Riptor, Black Orchid, Fulgore

DarkStalkers: Felicia

BlazBlue: Taokaka

God of War: Kratos

Spawn: Spawn

Bomberman: Bomberman

Dig Dug: Dig Dug

Dragon Ball Z: Vegeta, Goku

Sonic the Hedgehog: Shadow the Hedgehog, Sonic the Hedgehog, Dr. Ivo "Eggman" Robotnik, Metal Sonic, Miles "Tails" Prower

Harry Potter: Harry Potter

Fatal Fury: Mai Shiranui

Transformers: Starscream

My Little Pony: Rainbow Dash

Halo: Master Chief

Doom: Doomguy

Mega Man: Dr. Albert W. Wily

Legend of Zelda: Princess Zelda, Link

Final Fantasy: Cloud Strife

Pokemon: Pikachu, Venusaur, Blastoise, Charizard

He-Man and the Masters of the Universe: He-Man

ThunderCats: Lion-O

Ninja Gaiden/Dead or Alive: Ryu Hayabusa

Strider: Strider Hiryu

Soul Caliber: Isabella "Ivy" Valentine

StarFox: Fox McCloud

Bucky O' Hare and the Toad Wars: Bucky O' Hare

Terminator: Terminator

Robocop: Robocop

Godzilla: Godzilla**

Avatar: The Last Air Bender: Toph Beifong**

Combatants by Crossover Series
While the combatants are true to staying in their home series, there have been times that they cross over in other media, like starring in special movies like 'Disney's Wreck-it Ralph', appear in such crossover fighting games like 'Super Smash Bros.' and the varieties of the 'vs. Capcom' series, and even special appearances in primetime animated adult shows like 'The Simpsons' and 'Family Guy', like with their home series, here are the following series that the combatants have crossed over in: Family Guy: Boba Fett, Wonder Woman, Mario, Justin Bieber, Luke Skywalker, Harry Potter, Starscream, Batman, Spiderman, Superman, Lion-O, Robocop, Luigi

Super Smash Bros.: Samus Aran, Yoshi, Mario, Sonic the Hedgehog, Princess Zelda, Princess Peach, Link, Pikachu, Fox McCloud, Luigi, Charizard

Marvel vs Capcom: Akuma, Rogue, Mike Haggar, Zangief, Felicia, Chun-Li, Thor, Spiderman, M. Bison, Strider Hiryu

Capcom vs SNK: Akuma, Zangief, Felicia, Chun-Li, Mai Shiranui, Blanka, M. Bison

Namco vs Capcom: Akuma, Mike Haggar, Zangief, Felicia, Chun-Li, Blanka, M. Bison, Strider Hiryu

Disney's Wreck-it Ralph: Zangief, Leonardo*, Dig Dug, Sonic the Hedgehog, Chun-Li, Dr. Ivo "Eggman" Robotnik, Blanka, M. Bison, Miles "Tails" Prower

Mortal Kombat vs DC Universe: Shang Tsung, Wonder Woman, Raiden, Batman, Superman, Shao Kahn

The Simpsons: Koopa Troopa, Mario, Sonic the Hedgehog, Justin Bieber, Luke Skywalker, Harry Potter, Batman, Spiderman, Pikachu, Luigi, Godzilla**

TMNT/Power Rangers crossover: Leonardo*, Donatello, Michelangelo, Raphael

TMNT Smash Up: Leonardo*, Donatello, Michelangelo, Raphael

Cartoon All-Stars to the Rescue: Michelangelo

Mario & Sonic at the Olympic Games: Yoshi, Shadow the Hedgehog, Mario, Sonic the Hedgehog, Dr. Ivo "Eggman" Robotnik, Metal Sonic, Princess Peach, Luigi, Miles "Tails" Prower

Playstation All-Stars Battle Royale: Kratos

Sega All-Stars/Sega Superstars: Shadow the Hedgehog, Sonic the Hedgehog, Dr. Ivo "Eggman" Robotnik, Metal Sonic, Miles "Tails" Prower

Sonic and Mega Man: Worlds Collide: Shadow the Hedgehog, Sonic the Hedgehog, Dr. Ivo "Eggman" Robotnik, Dr. Albert W. Wily, Metal Sonic, Miles "Tails" Prower

Muppet Babies: Mario, Spiderman

Muppet Show: Luke Skywalker

Tatsunko vs Capcom: Chun-Li

Project X Zone: Chun-Li

Queen's Gate Spiral Chaos: Mai Shiranui, Isabella “Ivy" Valentine

G.I. Joe and the Transformers: Starscream

Godzilla (Marvel Comics): Thor, Godzilla

Soul Calibur: Link (Gamecube version only), Isabella "Ivy" Valentine

Kingdom Hearts: Cloud Strife

The New Scooby-Doo Movies: Batman

Sesame Street: Batman, Superman

Pokemon Conquest: Pikachu, Charizard

Trivia

 * When it comes to the series with the most number of Death Battle champions, it is currently known to be a 3 way tie between 'Street Fighter', 'Marvel Comics', and 'Sonic the Hedgehog'; each with 3 Death Battle champions (Akuma, Zangief, and Blanka from 'Street Fighter'; Rogue, Thor, and Spiderman from 'Marvel Comics'; and Sonic the Hedgehog, Metal Sonic, and Miles "Tails" Prower from 'Sonic the Hedgehog').
 * When it comes to crossover series with the most Death Battle champions, it is known to be a 3 way tie between 'Super Smash Bros.', 'Marvel vs Capcom' and 'Disney's Wreck-it Ralph'; each with 6 champions (Samus Aran, Yoshi, Sonic the Hedgehog, Princess Peach, Link, and Fox McCloud for 'Super Smash Bros.'; Akuma, Rogue, Zangief, Thor, Spiderman, Strider Hiryu for 'Marvel vs Capcom'; and Zangief, Leonardo, Dig Dug, Sonic the Hedgehog, Blanka, and Miles "Tails" Prower for 'Disney's Wreck-it Ralph').
 * When it comes to the series with the most number of Death Battle losers, it goes to the 'Super Mario' series with the deaths of Goomba, Koopa Troopa, Mario and Luigi.
 * Also, including the series' champions Yoshi & Princess Peach, the 'Super Mario' series also holds the record for the series with the most combatants, winners & losers combined.
 * When it comes to crossover series with the most Death Battle losers, it also goes to 'Family Guy' with 9 losers made of Boba Fett, Wonder Woman, Mario, Justin Bieber, Harry Potter, Starscream, Batman, Lion-O, & Luigi.
 * Also, including the crossover series' champions Luke Skywalker, Spiderman, Superman, & Robocop, 'Family Guy' also holds the record for the highest numer of Death Battle combatants in a crossover series, winners & losers combined.