Being the last game in the series, many returning characters and new faces are making appearances. This game probably has the biggest roster of IB characters to date, many of them with their own personalities and depth.
Barnes
The game's main hero. Despite being sarcastic and incredibly violent and having problems with his emotions, Barnes is a heroic man fiercely dedicated to saving everything and protecting his friends and loved ones, no matter the cost. His determination is nearly limitless and unrivaled.
Paul
Barnes' best friend who accompanies him throughout the majority of the game. Fairly competent most of the time, though has a large tendency to be oblivious to many things and has weird behaviors he frequently shows, along with saying a lot of downright odd things, much to the chagrin of everyone. Nonetheless, he is a trustworthy ally and helpful combatant with hidden intelligence that occasionally surfaces.
Rick Ross
Famous rapper and lech that becomes a deity of God post the universe's implosion. Is very wise and helps the duo throughout their adventure. True to his department, he frequently spouts profanity and goes into rapping tangents that may or may not be related to important events that happen.
Doug Richards
One of the few known survivors of the universe's implosion, Doug is a friend of Joe's that currently runs a weapon shop due to having lost his celebrity status, his wife, his children, and basically everything else he had before; the shop is the only thing that he feels gives him a reason to live anymore.
Randall "Bony" Bingotti
The fellow southern mechanic/storage unit manager, and one of the few known survivors of the universe's implosion. He eventually gets his business back on its feet and is currently operating underground.
Vector Keith Talibret
A strange new major character that accepts the main characters' offer for help... but seems a little too enthusiastic about helping them. Despite his goofiness and horrible-looking residence, he is very intelligent and the universe's top source of information. Very mysterious, but quite polite and trustworthy/understanding of personal problems.
Trees of Life
Gigantic wise old trees that run the population of all life. Without a proper supply of water, they are unable to live, and therefore everyone will die. The duo help them re-hydrate early in the game as the first true part of their adventure, and afterwards become staunch allies. The biggest tree is the wisest, while the other two are snarky and mute.
Kiana Stevens
Paul's wife. She is very lustful and sarcastic, but nonetheless friendly and helpful and cares immensely for her husband. She is also a capable fighter and a former female soldier.
Apollo Jackson
A magician that knows more about the universe than anyone. ANYONE; not even Vector or Ross have the information he has. Stubborn and insufferable, but happy to help as long as you do his errands for him. He eventually warms up to the group.
? ? ?
A strange being that Barnes and Paul meet up with in a sewer. Seems very familiar...
Broski Broster
Best friend of Joe and former ally of Barnes and Paul that is currently the holder of the very, very powerful Ball Of Creation. A villain is currently holding him captive and is planning on using the ball to threaten everything. Will the duo save him in time?...
X-Pac
MAKE SOME NOISE! A wacky wrestler with a deceased wife and a host of messed up quirks. Underneath it all, he's a nice guy and will happily hand out info if the situation calls for it.
? ? ?/Mystery Guy
An extremely mysterious man in a red suit with a robotic voice synthesizer. Joins up with Barnes and Paul sometime after the early portions of the game due to his own personal journey to find out who he is. The duo eventually find out extremely shocking details pertaining to him...
Bloodro
The giant, fiery, vaguely animal-like being that runs the Four Hellsmen, a group of similarly animal-like crime lords throughout the world. After the group does some odd jobs for him, he eventually decides to join them... though this is after the halfway point. Is somewhat hot-headed (no pun intended) and will not hesitate to point out something amiss, whether it be other heroes or villains, but is very nice regardless. He is also extremely strong, able to kill enemies, but has trouble running for long periods of time due to his weight.
Barnes' Dad
Barnes' father. A very kind man, but is extremely incompetent when it comes to his job. Nonetheless, Barnes highly respects him and they mutually love each other deeply.
Rick Aji
Mayor of New Futoria. Is extremely rude and immature on the surface, and runs the place horribly, but it quickly becomes evident that he's using this as a front for his deep-seating marriage problems. He shows his true side soon after the group has a conversation with him.
Dethlurd
An arrogant knight that directly opposes Rick Aji and personally plans to overthrow his position and rule New Futoria himself. He quickly comes into conflict with the heroes and has an epic duel with them a while into the game.
Dr. Loid
The self-appointed guardian of the T-Rolls. He uses a translation dial to understand what they say, and after a while starts to mimic their habits. He comes by frequently, being their guardian, but leaves them alone every now and then due to his personal trust in them.
King of Everything
What the name implies. Nothing is known about him so far, so obviously his occupation leaves him open to many interpretations and assumptions.
Locke Jackson
The brother of Apollo. Is extremely old and somewhat fragile, having witnessed every major tragedy known to man, but is nonetheless polite and soft-spoken. A much more likable person than his brother, though he still gets along very well with him.
Officer Frank Brook
A rather stern, but very caring, officer that leads a quirky police squad. They show up every now and then, both to indirectly help the group and to kill them. Brook himself is arguably the quirkiest of them all, but is a VERY capable leader and fighter.
Vesna
A female angel that is top class in her partition. Due to personal issues with her master, she enlists the support of the group, and she in-turn helps them out a few times in their adventure.
Wolfgang
W-Pool Beach's kind-hearted bodyguard that is a friend of Bloodro despite his ties to criminal activity.
Zero and Yiddle Yaddle
A magician in a black robe with a purple mask accompanied by a horned cyclops. They claim to want to help the universe, but the group distrusts them due to their suspicious behaviors. Zero, being a magician, uses magic while Yiddle Yaddle has Bloodro-par strength and can cause fire tornadoes with ease.
And many more!