As of 22 November 2014, here's a list of NPC allies in the game:
- Adam Jensen – from Deus Ex: Human Revolution
- A man with short brown hair who wears all black with a dark grey coat. He has several augmentations, including metal arms. He looks at the battlefield and says, 'I never asked for this...'
- Albus – from the Castlevania series
- A young man who is also a member of Ecclesia. He wields the magical gun named Agartha.
- Tsarevna Alena* – from Dragon Quest IV
- The Tsarevna of Zamoksva. She is a young woman with orange hair, wearing a yellow dress under her blue cape and pointed hat. She is quite brave, and powerful with her claws on the battlefield.
- Alucard – from the Castlevania series
- A tall man with long silver hair dressed in a black outfit with a black cape and wields the Alucard Sword. The half-vampire son of Dracula.
- Artea – from the Lufia game series
- An elf with blue hair that wields a powerful bow.
- Arucard – from the Hellsing manga series
- A tall man with short black hair dressed in a dark grey suit with a red overcoat, white gloves, a large red fedora and circular sunglasses with an orange tint. Formally known as Dracula, he is perhaps the strongest vampire in existance.
- Ash Williams – from the Evil Dead movies
- A man who works in the Housewares section of S-Mart. He wears a blue shirt, dark brown khaki pants, and brown leather boots. He wields a boomstick in his left hand and has a chainsaw attached to his right hand. "Groovy."
- Bayonetta – from the game series of the same name
- A woman with a very tall figure who wears a black outfit. She wields four guns, one in each hand and one attached to the rear of her high heels on both feet.
- chaos – from the Xenosaga game series
- Appears to be a young man with white hair and a dark tan. He wears a dark blue shirt, white pants, a blue and yellow vest and gloves of the same color. He looks at the battlefield and says, "I guess there's no choice but to fight..."
- Chun-Li – from the Street Fighter game series
- An agent of Interpol. She has brown hair, wears a blue chinese dress with a gold trim, white boots and large bracelets with spikes on them.
- Cloud Strife – from the Final Fantasy game series
- A young man with spiky hair and wears the SOLDIER outfit. He wields the Buster Sword weapon.
- Dante – from the Devil May Cry game series
- A tall man with white straight hair and a long red trenchcoat. This is the brother of Vergil, the trickster Dante.
- Dart Feld – from The Legend of Dragoon
- A young man who wears red armor and a red bandana. He wields the spirit of the Red-Eyed Dragon.
- Dekar / Hydekar – from the Lufia game series
- A tall man with spiky dark purple hair who wears black armor, along with a sword and shield. In addition, he can use a variety of weapons. He looks at the battlefield and says, "Fighting random monsters in an arena is the second best thing I'm good at!"
- Don Kanonji – from the Bleach manga and anime series
- A spiritual medium. He wears sunglasses, a silly looking hat and a long cape. He's Karakura-Raizer: Spirit. And probably the most useless ally you can take into battle with you!
- Dovahkiin (the Dragonborn) – from The Elder Scrolls V: Skyrim
- A rare individual born with the blood and soul of a dragon but has the body of a mortal. A natural master of the Thu'um, otherwise known as Dragon Shouts.
- Harry Dresden – from The Dresden Files
- A tall man with brown hair. He wears all black with a dark brown duster and a dark brown hat. He carries his trusty staff with him.
- Guy – from the Lufia game series
- A tall man with blonde hair who wears black clothing with silver armor on top. He wields a large axe in battle.
- Ichigo Kurosaki – from the Bleach manga and anime series
- A young man with bright orange spikey hair and is wearing Shinigami robes with Zangetsu strapped to his back.
- Indiana Jones – from the Indiana Jones movie series
- A the well-known archaeologist. He wears a brown shirt, dark brown pants and boots. He also has a black leather jacket, a leather whip and his iconic dark brown fedora.
- Iori Yagami – from the King of Fighters game series
- A tall man with red hair who wears a black shirt and red pants. He looks at everyone and simply scoffs.
- Jimmy the Dwarf – from the Dwarves vs. Zombies Minecraft event
- A weak dwarf under the service of Old Man Willakers. The Old Man calls everyone Jimmy, regardless of their actual name or gender.
- Jin Uzuki – from the Xenosaga game series
- A man who wears a green and white outfit and carries a katana in hand. He is Shion Uzuki's older brother.
- Jr (Rubedo) – from the Xenosaga game series
- He appears to be a kid who wields two handguns in battle. While he appears young, he is actually older than what he seems and can be quite powerful.
- Judge Dredd – from the movie of the same name
- A tall man wearing the standard Judge uniform and a helmet that covers most of his face. He is the Judge, Jury, and Executioner. He looks at the battlefield and says, "I am the law!"
- Juliet Starling – from Lollipop Chainsaw
- A young woman with blonde hair and wears a purple San Romero Knights cheerleader outfit. Additionally, she is a zombie slayer who wields a large chainsaw that is pink with hearts on it.
- Julius Belmont – from the Castlevania game series
- A man who is the latest warrior in the Belmont family line to wield the Vampire Killer whip and perhaps is the strongest Belmont.
- Kaien Shiba – from the Bleach manga and anime
- The former Lieutenant of the 13th Division of the Gotei 13. He wears the standard Shinigami outfit and has a tattoo of the Shiba family crest on his arm.
- Kain Highwind – from the Final Fantasy game series
- A tall man that is a friend of Cecil. He wears dark blue and black dragoon armor along with a helm that is designed similiar to a Dragon. He is a highly-skilled Dragoon.
- Ken Masters – from the Street Fighter game series
- A man with medium length blonde hair who wears a red gi. He also wears a black belt and red gloves.
- KOS-MOS – from the Xenosaga game series
- A female android with red eyes and long blue hair. She wears a mostly blue and white outfit, along with a large blue and white visor. She analyzes the battlefield and says, "Eliminating enemy threat."
- Lenneth Valkyrie – from the Valkyrie Profile game series
- A legendary Valkyrie who wears blue armor with a white skirt attached to it. She is skilled in the use of swords and bows.
- Lightning – from the Final Fantasy game series
- A young woman with long pink hair who wears a modified Guardian Corps uniform. She carries her Blazefire Saber gunblade in hand.
- Maat – from Final Fantasy XI
- An old man who is a master of martial arts.
- Maria Renard – from the Castlevania game series
- A young girl with blonde hair who wears a pink and white outfit. She fights with the power of the four sacred beasts.
- Mario – from the Super Mario game series
- A plumber with a large bushy mustache wearing a blue long-sleeved shirt with red overalls over it and a red hat with an "M" on it. He looks at the group and goes "Hey paisanos!"
- Maxim – from the Lufia game series
- A man with red hair who wears light blue armor. He carries the powerful Dual Blade sword in hand.
- Mega Man – from the game series of the same name
- A short robot that is blue in color. Created by Dr. Light to defend the world against the evil Dr. Wily.
- Mega Man X – from the game series of the same name
- A taller version of Megaman and is also blue in color. He is the final creation of Dr. Light.
- Mr. Satan – from the Dragonball Z anime series
- A man with a large afro, large sideburns, a horseshoe mustache and giant muscles. He wears a dark brown dogi shirt, with a white belt wrapped around, white pants and black boots. The Earth's so-called "Greatest Champion!"
- Nauthima Tiranadel
- Is an Elven Goddess, who has tremendous magical might. She wears the Red Mage AF armor and wields a large staff along with a sword on the left side of her waist. A former boss who now assists the forces of good.
- Bruce Willakers (or Old Man Willakers) – from the Dwarves vs. Zombies Minecraft event
- Bruce is a legendary Dwarf with incredible power and a long white beard. While he might be an old man, don't let his age fool you! He looks at the battlefield and says, "Drink your juice, Jimmy, and fight the monsters! Also, stay away from me or I'll death stare you!"
- Orphen – from the manga and PS2 game of the same name
- A young man with brown hair who wears a dark grey shirt with black pants and a black vest. He also wears a dragon necklace around his neck. He is a powerful magic user, though can be lazy at times.
- Prishe – from Final Fantasy XI
- Appears to be a young Elvaan female with long lavender hair, pointed ears and blue eyes. She wears black shorts with a black top and frilly purple sleeves, along with tan boots.
- Rare Akuma – unofficially from M. U. G. E. N.
- A fighter with red hair and a gray dougi on. He is Gouki, the strongest fighter and is said to be a great demon.
- Richter Belmont – from the Castlevania game series
- A man with brown hair who wears a blue shirt and white pants. A powerful member of the Belmont family that wields the Vampire Killer whip.
- Robocop – from the movie and TV series of the same name/dt>
- A cyborg cop in silver and black armor. He carries his large Auto9 gun in hand. "Dead or alive, you're coming with me, creep."
- The Rock – from the WWE
- A tall man with a dark tan and a tattoo of a bull on his right arm along with a large Aztec tattoo that covers his left shoulder, arm and part of his chest. The Rock enters the battlefield and shouts, "Finally, The Rock, has come back to the Battle Arena!" A wrestler
- Rose – from The Legend of Dragoon
- A mysterious woman who wears dark purple armor that has a gold trim. The wielder of the Darkness Dragon spirit.
- Rukia Kuchiki – from the Bleach manga and anime series
- A short young woman with short black hair and is the current Lieutenant of the 13th Division of the Gotei 13 and is also the younger sister of Byakuya Kuchiki.
- Ryu – from the Street Fighter game series
- A man with medium length brown hair and wears a white gi along with a black belt. He also wears red gloves and a red bandanna.
- Ryudo – from Grandia II
- A young man who wears a dark blue outfit. His companion is a talking bird named Skye, who stays by his side.
- Samus Aran – from the Metroid game series
- A tall woman with blonde hair who wears a Chozo power suit that is red and orange in color. Known to the Space Pirates as "The Hunter."
- Selan – from the Lufia game series
- A young woman with blue hair who wears a white oufit. She wields a sword and staff in battle.
- Shanoa – from the Castlevania game series
- A young woman who is a member of Ecclesia and a powerful user of magical glyphs.
- Shantotto – from Final Fantasy XI
- A Tarutaru who wears the Black Mage AF armor, excluding the hat. She is well-known in Windurst and one of the strongest magic users in Vana'diel. She is also very arrogant! "O~hohohohohohoho!"
- Simon Belmont – from the Castlevania game series
- The legendary Vampire Hunter and a strong member of the Belmont clan. He is a master with the Vampire Killer whip.
- Son Goku – from the Dragonball Z anime series
- A Saiya-jin who was sent to Earth as a baby. He wears an orange dougi over a blue shirt and has black hair.
- Soma Cruz – from the Castlevania game series
- A young man with white hair. He wears black clothes along with a white and silver coat.
- Squall Leonhart – from the Final Fantasy game series
- A young man with brown hair who wears a white shirt, black pants, and a black coat. He has a silver chain with a Greiver pendant on it as well. He wields a gunblade in hand.
- Sui-Feng – from the Bleach manga and anime series
- A short, young woman who is the 2nd Division Captain of the Gotei 13 and current Commander-in-Chief of the Onmitsukidou.
- Terry Bogard – from the King of Fighters games
- A muscular man wearing a white shirt, blue jeans, a red vest with torn sleeves and his trademark baseball cap. He grins and gives a thumbs up!
- Tia – from the Lufia game series
- A young woman with long purple hair. She wears a pink dress and uses a whip as a weapon.
- Urahara Kisuke – from the Bleach anime and manga series
- A tall man with light blonde hair. He wears a dark green shirt and pants, along with a black coat, wooden clogs on his feet and a bucket hat with green and white stripes.
- Vyse – from the Skies of Arcadia game
- A young man with brown hair that is a member of the Blue Rogues. He wears a blue and black outfit and uses two swords in battle.
- Yoko Belnades – from the Castlevania game series
- A woman with long blonde hair that is a member of the Belnades clan. She wears a red and black outfit.
- Genryuusai Shigekuni Yamamoto
- An old Shinigami who is the Captain of the 1st Division and the Captain Commander of the Gotei 13. The oldest and strongest Shinigami who also carries the powerful Ryuujin Jakka zanpakutou.
- Yoruichi Shihouin – from the Bleach manga and anime
- A woman with dark skin, long purple hair and golden eyes, dressed in a black sleevless shirt, black pants, white shoes and an orange coat. The former 2nd Division Captain of the Gotei 13.
- Zero – from the Megaman X game series
- A robot who wears red and white armor with blonde hair and wields a powerful beam saber in hand.
* Alena has been added to the IRCHighway Arena by Andrio, and is not present in Battle Arena officially.