The Blank: The Batter's face does have eyes, but the way it's drawn makes it look like he's either got four eyes, two normal but closed eyes and a pair of eyebrows, two eyes over eye black or just no eyes whatsoever.
Determinator: He'll stop at nothing if it gets him closer to completing his mission.
Karma Houdini: If you think the Batter is evil and still choose the official ending, though it is implied he may have killed himself along with everything else.
Knight Templar/Well-Intentioned Extremist/Omnicidal Maniac...the list goes on. Extremely dependent upon individual interpretation of his actions and the revelations of the game. Views range from the Batter performing a Mercy Kill on a hopelessly twisted and dying world all the way over to him being a psychotic and destructive monster.
The Medic: The only one with the skills to heal HP.
Humanoid Abomination: Even bordering on Eldritch Abomination, as seen by The Judge and Player if the latter decides to betray The Batter. Mortis has commented the change in appearance isn't a literal transformation, rather is symbolic of how the Batter has changed from a hero to a monster in the Judge's and Player's eyes.
Precision F-Strike: In the original translation, he lets an F-bomb slip when he realizes Enoch is invincible. This was, however, a mistake in the translation and has been changed in the newest version. He does call Enoch a lardass in all versions.
Soft Spoken Sadist: He's pretty calm for a guy who bats monsters to death. Even before destroying the world he doesn't seem to change his tone.
You Cannot Grasp the True Form: The special ending may bring up implications of this sort. Perhaps you could only see the Batter's true form when looking through the Judge's eyes. Word of God has said the Bad Batter is not a literal transformation but rather a representation of how he's become a monster in the eyes of the Player and the Judge.
You, the player, are a distinct character in this story, viewed as a mysterious entity controlling the Batter. Nearly all possible mentions of what happens are spoilers due to the very nature of the story.
Big Bad: You're the one in direct control of the Batter and he can't act without you. If you think the Batter is the Villain Protagonist, well guess what that makes you...
Face-Heel Turn/Heel-Face Turn: Which one it is depends upon both what you think of the Batter by the final confrontation of the game and whether you pick the Judge's side or not.
Suicide by Cop: In the final area of the Room, he faces the Batter knowing he'll die, as he's unable to live with the guilt of not seeing the Batter's true intentions and effect earlier. Whether he lives or dies depends on the ending.
Enoch: The people were happy, before the phantoms came. Incidentally, I still don't understand why the dead won't just disappear anymore.
The enemies of the game, who haunt the Zones for unknown reasons. It is suggested in some parts of the game that they might be under the control of the Queen herself, but that is never proven one way or the other.
Not Me This Time: Even though the Guardians are guilty of various things, none of them are in charge of the spectres or have a clear idea of why they are becoming a problem. Japhet eventually believed that he could sick them on the Elsens, but it is unclear whether that was a delusion or an actual ability that stopped due to the Batter's presence.
Utopia: Had all dreamed of making the rebuilt world into one, though each had his own idea of how to go about it.
"I command you. Fuck off this instant, if you want to keep your job."
The Guardian of Zone 1. He's an incredible jerk with a foul mouth that pushes the Elsens around and even sends a few death threats the Batter's way.
Animals Hate Him: He comments he got bitten by a cow, of all things, when encountered in the Room.
Pet the Dog: In the Room he softens when Hugo becomes upset and offers his coat to dry Hugo's tears, despite being in pain from the cow bite.
The Pollyanna: Surprisingly, he sure tries to be upbeat in the Room. Though this depends on how you interpret the events of that area.
Signature Laugh: Similar to the Fat Spectres, except his speech bubble has the character for "laugh" in Chinese/Japanese.
Theme Naming: Timekeeping. His competences are based on clock hands. And in the Room, he complains that it's been the same time for a while now (due to his clock being broken), so he wants a calendar page. Not to mention a clock ticking in slow motion is part of the BGM in this particular section.
Took a Level in Jerkass: Was a nice guy in the Room, but somehow turned into a huge jerk that bullies his own workers.
Fallen Hero: Unlike Dedan and Enoch, a lot of time is spent going into Japhet's backstory. He had tried to please the Elsens and make them feel safe, yet they still became too paranoid and neurotic to enjoy anything or be grateful. When the Batter rises to destroy him, Japhet knows that he is right to do so.
Motive Rant: Though a short one, Japhet gives you one right before the proper battle with him starts:
Japhet: You must understand... those fools... they only care about their selfish, pathetic hassles! I did everything for them! They are like my own children... and like all disobedient children, they need to be punished.
Beware the Silly Ones: Dedan is a demon with nasty-looking jaws, a Badass Longcoat and a foul temper. Japhet has an element of silliness (he has a cat on his head!) but looks fairly intimidating, and is certainly more than insane enough to match. Enoch is... a fatass man wearing a shirt and tie and sporting a positively silly facial expression. He is also the most powerful of the three Guardians by far, and is completely invincible until The Batter tires him out.
Clipped Wing Angel: Though he's even bigger than before when you fight him properly, he's also tired out from chasing after you.
Well-Intentioned Extremist: He's the only Guardian that doesn't defy his own goals. However, after he started giving his subjects the new substance he'd created, and they got addicted to it, things started to drift out of control...
The Queen, Vader Eloha
"I am gravely disappointed."
A mysterious woman who rules over all of the Zones. Though you hear a little bit about her throughout the game, you don't find out who she is until the end. She, like the Batter, has three Add-Ons of her own: Delta, Sigma and Ipsilon.
Combat Tentacles: Some interpret her having long tentacles wrapped around her body, others see a belt of some sort and normal arms held behind her. Tentacles or no, she doesn't seem to use them in the fight.
Meaningful Name: Her name translates to "Father God", alluding to how she created and rules over the Zones from afar. May or may not throw further wrenches into Hugo and the Batter's family chart and symbolism.
Evil Sounds Deep: The aggressive, sugar-addicted Elsen in Zone 3 have much deeper breathing.
Inexplicably Identical Individuals: Most of the time they don't change from the normal business attire look beyond adding labcoats or hard hats. The sugar-deprived Elsen in Zone 3 have larger eyes and they appear to be baring their teeth.
Nervous Wreck: They're afraid of pretty much anything that challenges their status quo.
Ungrateful Bastard: Though more due to fear than Jerkassery, they immediately evict you and take your necktie once you save them from spectres in Zone 2 due to carrying an "awfully dangerous" bat, and in the same zone, Japhet calls them out on this several times.
The things that Elsen turn into when stressed. Always victims of some kind of body horror.
Body Horror: Basically describes them. All Burnt usually have different kinds of body horror but all have missing heads - the Pastel Burnt in particular looks like some kind of dinosaur creature, and sometimes spawns Elsen-heads from its mouth.
Mercy Kill: The Critic Burnt in Zone 3, who doesn't even fight back.
Unique Enemy: Different ones for every Zone. Zone 3 in particular has the one-off Pastel and Critic Burnts. Strangely, the Room, despite featuring Elsen, has no Burnt of any kind.
Verbal Tic: Before turning into Burnt, Elsen usually have higher-pitched breathing.
Your Head Asplode: All Burnt have this, so it's considered their "trademark". This trope is even Lampshaded by an Elsen in Zone 2's time-based mission.
"But enough blether. I'm not one of those protagonists you need to listen to for hours. So, lemme see the color of your credits."
A traveling merchant who provides the Batter with goods. His items change depending on where he is, so make sure you check with him often. He also briefly takes over the Judge's job in Zone 3, when the Judge has his Heroic BSOD.
Hidden Depths: Some hidden content in the games hint that he is more important than he appears to be. In Zone 2, the Elsens end up slipping that he is the owner of The Park, and seem surprised that you have "proof" you know him, if you manage to get the Photo of Zacharie. In Zones 0 and 3, he refers to the Judge as "Pablo", possibly being his true name. And more, Hugo's almost unreadable notes in the Room's calendar say something among the lines of "Zacharie is the best guy I know, he's my friend." Bonus Boss Sugar also apparently knows him, as she asks you to tell him goodbye for her before she dies.
Paper-Thin Disguise: After The Judge's Heroic BSOD, Zacharie disguises himself as him in order to continue helping The Batter. No one is fooled. His usual laugh when the Batter talks to him is even replaced with an unconvincing "meow."
Took a Shortcut: Zacharie uses and acknowledges this trope, appearing ahead of the Batter as needed. Once he challenges the player to get to a place before him, only to inevitably win but give a prize anyway as it was all "scripted". At one point, however, he does appear running back and forth between two close and connected rooms.
Verbal Tic/Signature Laugh: A snarky snicker, sounding like a soft "heh heh heh." When he's wearing his cat mask while filling in for The Judge, it's an unconvincing meow.
The Judge's brother, another cat. Normally wanders around Zone 2.
Killed Off for Real: When the phoenix Japhet bursts out of his body in the boss battle in Zone 2. Zacharie wears a mask resembling his face while filling in for the Judge during his BSOD, possibly as a tribute.
Nice Guy: The reason why Japhet was able to take control of him? Valerie tried to eat him when the bird was small, but was too nice and didn't chew him up. Japhet berates Valerie for this before the proper battle with him.
People Puppets: Under the control of Japhet, apparently due to eating the latter.
Verbal Tic: A purring sound similar to the Judge's, though somewhat higher pitched and faster.
We Hardly Knew Ye: Right after we finally learn a bit more about him, he is killed by the Batter. An in-universe example as well, since without using Wide Angle on him, it seems the Batter doesn't even know his name.
Zero-Effort Boss: He does nothing but defend. Of course, he can't really do much other than defend himself since he's just a toddler.
A strange girl hiding in a basement with piles and piles of sugar under Zone 0. She can only be found if you manage to find the Grand Finale item in purified Zone 1.
Art Shift: She was drawn by a different artist, hence why she looks a bit more realistic than the others.
Damage-Sponge Boss/Marathon Boss: Has a whopping 12000 HP, and her four candy "Dummies" constantly boost her stats, making her harder to kill. She is significantly easier to kill if you face her after receiving addon Epsilon, as his AoE moves can kill all the Dummies in one hit.
Hidden Depths: Knows Zacharie somehow, as she asks you to say goodbye to him for her when you kill her.
Only seen in the secret ending, a race of sapient simians who were waiting patiently for the Guardians and the Queen to be defeated and the Zones to be erased. Now that the world is empty, they have a place build their robot factories and win the war against the flying brains.