Characters / The Final Timeline

Spoilers are unmarked. You Have Been Warned!

Main Characters

Frisk

The main character of the story. Kicks off the entire story by splitting her soul in half in order to resurrect Asriel.

• Ambiguous Gender: Subverted. While Frisk's gender in-game is up to interpretation, they are solidly identified as a girl in this story.
• Action Girl: With Frisk's gender solidly being identified as a girl in this story, she falls neatly under this trope. Being able to summon a sword as an extension of her Determination, Frisk can hold her own against Gaster. In fact, she's the one who deals the final blow to Gaster, even when her Determination has been removed and her life is hanging on by a thread.
• Call-Back: After Frisk dispatches Gaster, Asriel begs Frisk to stay determined. Her final words are a call-back to the end of the True Pacifist route.
  "Heh... you always were a crybaby..."
• Curse Cut Short: During the first battle against Gaster, Frisk realizes she can't use her magic due to her soul being split in half. Before she can finish her sentence, she gets slammed in the face with a telekinetically thrown table.
  "Oh, sh"- >WHAM!<
• No One Gets Left Behind: Frisk wasn't very happy that everybody in the Underground got to live free, happy lives on the Surface except Asriel. So she set out to carve an ending of her own... and she succeeds, kicking off the events of the story.

Asriel

The secondary protagonist of the story. Was resurrected by Frisk due to her giving him half her soul.

• The Berserker: While he doesn't actively fight during the majority of the story, during the battle in the True Lab, he goes into an Unstoppable Rage and attacks Gaster with every fiber of his being, shrugging off his attacks like they're nothing and tearing Gaster a new one.
• Beware the Nice Ones: Sure, Asriel seems unassuming and non-threatening during the first major chunk of the story. But then, during the battle in the True Lab, Gaster drains the Determination out of Frisk and severely injures Asgore. Three guesses as to what happens next.
• Black Eyes of Crazy: When Asriel flies into an Unstoppable Rage against Gaster, his eyes become a cross between this and Red Eyes, Take Warning.
• Curb-Stomp Battle: Asriel gives one of these to Gaster during the final battle. Gaster can barely hold his own, and Asriel ends up cleaving his Sinister Scythe in two and blasting him with his Hyper Goner.
• Death Glare: When he goes One-Winged Angel, Asriel gives one of these to Gaster. It's enough to make the scientist take a step back in fear.
• One-Winged Angel: Asriel's Roaring Rampage of Revenge causes vines to sprout from his back, a la Dock Ock. His eyes become black with red pinpricks of light in the center. He also can turn his arms into vines as well, which he can use as whips.
• Playing with Fire: One of the attacks Asriel uses during his Curb-Stomp Battle with Gaster are rainbow fireballs.
• Shut Up, Hannibal!: Asriel doesn't care whether you're The Man Who Speaks In Hands or the Man on The Moon. You hurt his family? You're in for a world of pain.
• Unstoppable Rage: Hoo, boy. Asriel sure does deliver when it comes to this. After Gaster extracts Frisk's Determination and critically wounds Asgore, Asriel flies into the motherlode of these. According to the story, Asriel attacks with such speed and strength that one well placed strike cleaves Gaster's scythe in two.
• Wave-Motion Gun: Asriel's Hyper Goner. Strong enough to critically wound Gaster, and leave him weak enough for a dying Frisk to stab him In the Back.^Note Saying that the Hyper Goner was enough to critically injure Gaster is worthy of noting. In the Undertale game files, Gaster has 666,666 health. Considering that Asriel also threw a fireball at Gaster, and that Frisk stabbed the scientist a few moments later, Asriel's Hyper Goner did, at most, 666487 damage.

W.D. Gaster

The main villain of the story. Having been partially resurrected by excess Determination thrown off from Frisk's soul-split, Gaster seeks to completely re-form himself by extracting the Determination from Asriel's Soul.

• A God Am I: Gaster adopts this mindset after being fully reconstituted. Not that Asriel cares...
  Do you really think you can defeat ME!? I am The Man Who Speaks In Hands! I AM ALL-POWERFUL!
• Agony Beam: Before Rage-Fueled Asriel can stab Gaster, the scientist electrocutes him with black bolts of lightning shooting from his hands. It doesn't do any damage, and it appears to only cause unbearable pain.
• And I Must Scream: After falling into one of his creations, Gaster ends up being erased from existence.He could do nothing but watch from the Void between realities as the universe marched on without him. If Frisk hadn't given part of her SOUL to Asriel, shedding excess Determination and allowing him to be semi-ressurrected, he would have been stuck there forever.
• Body Horror: Two large cracks adorn Gaster's face: one that slices into his right eye; another that bridges his left eye and mouth. He also has a large hole bored into the palms of his hands.
• Improvised Weapon: The first time everybody goes up against Gastr, he uses his telekinesis to throw tables and chairs around to use them as projectiles.
• In the Back: Gaster is killed this way by Frisk. However, his Determination keeps him alive despite the wound, and it takes Sans vaporizing him with a Gaster Blaster to properly finish him off.
• Mark of the Beast: While not being directly mentioned in the story, Gaster has 666,666 health, and 666 Defence and Attack. This the most likely reason why nobody seems to even scratch him. Well... almost nobody.
• Power Parasite: While in the True Lab, Sans attacks Gaster with a ring of his Gaster Blasters. It seems like it's working at first, but then Gaster uses his magic to take control of and corrupt the Blasters. He attacks Sans with them, and if Papyrus hadn't intervened, Sans would most likely have been blasted to smithereens.
  Did you really think your Blasters would work on me? On the man who gave them to you?
• Shock and Awe: In a last-ditch attempt to incapacitate Rage-Fueled Asriel, Gaster pulls an Emperor Palpatine and shoots black lightning from his fingertips.
• Sinister Scythe: Gaster uses one of these as his main weapon. He can either use it like a sword, or windmill its blade to deflect projectiles. It's also really strong, as one swipe is enough to severely injure Asgore.
• Villainous Breakdown: After Gaster has his ass handed to him on a silver platter by Asriel, Gaster falls into one of these. He flings everybody into a wall with his telekinesis and nearly blasts them into dust. Good thing Frisk intervened when she did.
• Well-Intentioned Extremist: Gaster only wanted to come back so he could finish his research and potentially save monsterkind. Granted, his methods are a little... unorthodox, but he meant well.
• Would Hurt a Child: Gaster has no problems extracting the Determination from Asriel, even though that would kill the young monster. Either his time in The Void has twisted his mind, or he just doesn't care.

Supporting Characters

Toriel

The Ex-Queen of The Underground, and mother of Asriel. Left her husband, King Asgore, to live in The Ruins after their children- Asriel and Chara- died and Asgore declared war on humanity.

• Elemental Weapon: During the battle in the True Lab, Toriel channels Marvel's Ghost Rider and wields a fiery whip.

Asgore

The King of The Underground, and father of Asriel. While he doesn't want to hurt anybody, he will if he feels he has to.

• Prongs of Poseidon: Asgore wields a blood-red trident with a flower embedded beneath the prongs. He can throw the trident like a spear, or spin it to block incoming projectiles.

Sans

A skeleton monster, the brother of Papyrus and son of Gaster. Short, chubby and has a penchant for bad puns and ketchup.

• all lowercase letters: Sans always speaks entirely in lowercase letters with his signature font: Comic Sans. However, whenever he becomes serious or really pissed off, his speech gains normal punctuation and a bold EB Garamond font.
• Dem Bones: Sans, like his brother and father, is a skeleton-type monster.
• Mercy Kill: After Frisk stabs Gaster, his increased Determination keeps him alive, but causes his body to start breaking down. In a show of mercy, Sans blasts Gaster into oblivion, putting the scientist out of his misery.
• Pre Ass Kicking Oneliner: After Gaster takes advantage of Papyrus' pacifism and injures him, Sans steps in and utters one line:
  That was a mistake.
• Wave-Motion Gun: Sans' signature attack, the Gaster Blaster, is a giant skull that shoots laser beams. He uses them to great effect during the Battle in the True Lab, but they're stolen from him by Gaster, the man who bestowed the Blasters upon him.

Papyrus

A skeleton monster, the brother of Sans and son of Gaster. He is very energetic and friendly, and always strives to see the best in everybody he meets.

• Badass Pacifist: Papyrus, while not wanting to hurt anybody, is able to hold his own against Gaster relatively well. However, when Gaster nearly kills Sans, Papyrus goes all out, no longer holding back.
• Big Brother Instinct: Goes two ways, actually! When Gaster steals Sans's Gaster Blasters and fires them at him Papyrus steps in front of his brother and engages Gaster in a brief Beam-O-War. He holds of the beams until Gaster extinguishes them, then attacks him with a renewed ferocity, all thoughts of giving the man who almost killed his brother mercy out the window.
• Combination Attack: During the fight in the True Lab, Papyrus does this with Mettaton. Papyrus summons a bunch of bones, which Mettaton charges with electricity. The bones impale one of Gaster´s clones, then electrocutes the other clones.

Undyne

The Captain of The Royal Guard. She harbors a deep hatred for humans until Frisk comes along.

• Heel–Face Turn: During the first chunk of the story, Undyne harbors a deep hatred for Frisk, telling her that Asgore's protection is the only thing keeping her from killing Frisk and taking her soul. After the first battle against Gaster, however, Undyne sees the error of her ways and apologizes, much to the surprise of the others.
• Shut Up, Hannibal!: After Gaster regains his full power, Undyne cuts his speech short with a volley of spears.
  Gaster: At last! I am COMPLETE! I am whole once more! I AM-
  Undyne throws a volley of spears at him.
  Undyne: You're about to get your ass kicked!!!

Alphys

The Royal Scientist and successor of Dr. Gaster. Responsible for the creation of Mettaton, and is a huge anime nerd.

• Badass Normal: Despite having no powers of her own, Alphys is the one who managed to find a way to track down a kidnapped Asriel by using Frisk's soul signature. She also made Mettaton's NEO body much more durable, and is a dead shot with her laser pistol.

Mettaton

The sole TV star of The Underground, Mettaton is a robot built by Dr. Alphys, and possessed by the ghost of Napstablook's cousin.

• Arm Cannon: Mettaton's NEO form has one of these. It has three separate mode: one that shoots lasers like a machine gun; one that shoots a spread of lasers; and one that fires a ball of energy like a rocket launcher.
• Adaptational Badass: In the game, Mettaton NEO had a cool design for a boss, but went down in one hit and didn't even attack you. Here, he's much more useful- and badass- thanks to an upgrade Alphys made for him. Now he can shoot lasers like a machine gun, fling balls of energy like a rocket launcher, and even fly.

Minor Characters

Burgerpants

An employee at the MTT-Brand Burger Emporium. He's also Mettaton's cameraman and, while Mettaton is off rescuing Asriel/preparing for a concert, a reporter.

• Ascended Extra: Burgerpants' role in the game is nonexistent, simply being a shop vendor at the MTT Resort. Here, his skills are greatly expanded. Now he's a cameraman, and when Mettaton is off being part of the main crew, a reporter.