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Note: You can technically play through all routes of Undertale in a single game copy, hence all routes will be taken into account.

Background

The 8th human to fall into the underground of mount Ebott. In the underground, monsters from a previous age of Earth have been imprisoned behind a magic seal, and require the power of 7 human souls to break said seal. They’re led by Asgore, a monster king who’s murdered multiple humans for the sake of breaking this seal. In order to escape back to the surface Frisk must make their way through hordes of monsters to reach Asgore and hopefully pass through the barrier blocking off the surface.

The wrinkle in this plot is that Frisk has the ability to manipulate time, allowing them to save and reload previous locations in time. Using this power Frisk can either complete their journey by pacifistically befriending all monsters, or mercilessly killing everyone.

At the end of the “pacifist” route Frisk battles Asriel, who was Asgor’s former son Asriel and had been revived in a botched nihilistic form known as Flowey. After reminding Aseriel of their humanity, they break the barrier in Mount Ebbot using the power of the human souls Asgore had previously acquired.

In the “genocide” ending Frisk kills every monster in the underground and becomes possessed by Chara, the spirit of the first human that fell in the underground. This storyline ends with Chara destroying the universe. Should the player try to reset the game and do a new pacifist playthrough after completing the genocide ending, Chara will hijack the story and give them a bad ending regardless.

Arsenal

Stick

A wooden stick. It can be used as a melee weapon and can distract dogs if thrown.

Frisk using the stick https://youtu.be/bJHS3pRPFhc?t=67

Toy knife/Worn dagger

A plastic toy knife and a worn dagger. They can both be used for slashing attacks.

The toy knife weapon https://youtu.be/zp3V0EHxCuw?t=5

Tough glove

A pair of gloves used for rapid punching attacks.

Frisk using the tough gloves on Undyne https://youtu.be/2sqb-KuFeeQ?t=48

Burnt pan

A frying pan used for multi hit attacks. When it’s equipped, consumable items heal additional damage.

Frisk using the burnt pan against Sans https://youtu.be/HVFPZAF1xpk?t=84

Empty gun

A revolver gun. It lacks bullets but is still somehow able to shoot out projectiles. Given the projectiles are shaped as the stars used for saving, some speculate its projectiles may be some form of determination.

Frisk using the empty gun on Sans https://youtu.be/BgSUUbBqI7Q?t=51

Ballet shoes

Ballet shoes used for rapid kicking attacks.

Frisk using the ballet shows against Undyne https://youtu.be/wV6yew3pquY?t=15

Torn notebook

A large notebook. It increases invincibility frames after being hit by an attack in game. It’s implied to be used to both hit opponents and block attacks.

Frisk using the torn notebook against Undyne https://youtu.be/qXvF2bSP9ms?t=26

Real knife

A “real” sharpened knife. It has the highest attack stats in the game. It’s only obtainable in the genocide ending.

Frisk using the real knife https://www.youtube.com/watch?v=HUA_U_GD_7U

Armor

List of all armors in game https://www.youtube.com/watch?v=bKFcWpK2_IU

Bandage: A bandage the Frisk was wearing when they first fell into the underground. It allows them to escape from fights more easily and can be used as a healing item when taken off.

Faded ribbon: A faded ribbon that increases defense by a small amount.

Manly bandana: A bandana that moderately increases defense.

Old tutu: A tutu that moderately increases defense.

Cloudy glasses: A pair of glasses that moderately raises endurance, and increases invulnerability frames.

Stained apron: An apron that Increases defense and also passively heals HP.

Cowboy hat: A hat that increases defense and attack power.

Heart locket: A locket worn by the first human Chara. Increases defensive power.

Temmie armor: The most powerful armor in the game. It increases defense,attack power and lengthens invulnerability frames. It also passively recovers Frisk’s HP.

Equipment

Misc healing items

Frisk can carry around various healing items, including pies, donuts, teas, or other foodstuffs. The most powerful is Butterscotch pie, which recovers full HP.

List of consumables here

Phone

A cell phone initially given to Frisk by Toriel. It’s later upgraded by Alphys. It can connect to the underground social network, summon a jetpack(with a limited fuel supply), defuse bombs and access dimensional boxes to store items remotely. It can also activate “yellow soul mode”, which gives Frisk the ability to shoot energy projectiles from their body.

Frisk using the phone https://www.youtube.com/watch?v=yqcl_cOZ-W8
The phone Jetpack mode https://youtu.be/Y-sEcbtRhzg?t=1586
Yellow soul mode https://youtu.be/ogNHObCZjwU?t=92
The bomb diffusion mode https://www.youtube.com/watch?v=Nw7JFJUCfW0

Abilities

Actions

Actions are situational physical skills that can be used against monsters in the underground. The vast majority of them don’t have any notable effects to combat, but a few can alter stats or status effects.

Flex

A flexing motion used against the monster Aaron. Temporarily increases attack power.

Frisk using the flex action https://www.youtube.com/watch?v=vKL74AzHjuQ&feature=youtu.be&list=PLxyG63y66psw2S_Evd2zr8XDffkLXv_5d&t=522

Clear mind

The ability to clear one's mind. Prevents Frisk from becoming confused or having controls inverted by the Magjik enemy.

Frisk using clear mind https://youtu.be/bEP6VxzfnLo?t=9

Draw

Allows Frisk to draw an object into reality. Used during the fight against So Sorry.

Frisk Draws a boat https://youtu.be/6qjtArxeO2w?t=146

Heat up/Cool down

Allows Frisk to “crank up or down a thermostat” increasing the heat or coolness of the surrounding area. Used against Pyrope.

Frisk uses Heat up https://youtu.be/xYBehCeztrw?t=101

Sing

Allows Frisk to sing an opponent into a deep sleep. Used against Knight Knight.

Frisk uses the Sing action https://www.youtube.com/watch?v=5JOcC1uz1oM&feature=youtu.be&t=1

Stare

Allows Frisk to weaken magical items by staring at them. Used against Magjik enemies.

Frisk uses the state action https://youtu.be/2FskA9P1aMo?t=38

Flirt

The ability to flirt with characters. You have the option to do this alot for some reason.

All flirt actions https://www.youtube.com/watch?v=HeQ4xHa_Reg

Steal

Frisk can steal objects, such as Ice cap’s cap.

Frisk uses the steal option https://youtu.be/euyUdtam_lU?t=73

Determination

Determination is a major concept in the Unertale series. Determination is essentially the “will to live” or to push on through difficult situations. It’s a substance found within most human souls, and the person who has the highest determination in the underground can cheat death via access to the save/load/reset system. High enough determination can also grant regenerative powers or minor reality warping.

Saving/load

The ability to save your placement in a timeline, and then later reload yourself to that exact location in time/space. Conventionally it works like the save system in a traditional RPG. If Frisk fights a person with greater determination than their own, that person can hijack control over this system.

Frisk saving https://youtu.be/EJrs_2vjF98?t=1812
Flowey overwrites Frisk’s save https://youtu.be/0WqgW8swea0?t=674

Reset

The ability to reset Frisk’s progress back to when they originally fell into the underground. It resets all items, story actions and leveling back to 0.

Frisk using the reset power https://youtu.be/p4jNN6496qQ?t=18

True reset

A more powerful variation of the reset power. It resets even those with ripple proof memories.

Frisk does a true reset https://youtu.be/8t48LHe4WyE?t=101

Ripple proof memory

Those with high determination or access to the save/load system retain their memories across multiple timelines or timeline resets.

Flowey remembers if you kill Toriel and reset https://youtu.be/9Kt2f5Lw21I?t=15
Various examples of reset conversations https://www.youtube.com/watch?v=L7FEyO9kphA

Immortality

With high enough determination Frisk can instantly revive from death mid combat. They can even outright refuse to die regardless of the power of the attack used against them.

Frisk reviving mid death https://youtu.be/EcctG__QTco?t=769
Frisk refuses to die https://youtu.be/EcctG__QTco?t=1418

Hope

An ability Frisk can use at max determination. Frick’s “hopes” can reduce damage received from opponents.

Frisk uses the hope ability ://youtu.be/EcctG__QTco?t=551

Dream

An ability that Frisk can use at max determination. It allows them to create infinite “dream” items that can be consumed to recover HP.

Frisk creates a dream consumable https://youtu.be/EcctG__QTco?t=562

Chara

The first human to fall into the underground. It is HEAVILY implied that Chara’s spirit somehow attaches itself to Frisk’s soul and that they become the narrator in all routes of Undertale. In the genocide route their presence becomes much notable, as they possess Frisk towards the end of the route and destroy the game of Undertale after all other characters in the game have been killed.

Check

The ability to relay information on enemies and allies to Frisk during fights. It’s heavily implied Chara is the one to do this.

All checks https://www.youtube.com/watch?v=0UUMbSV4a_I

Exp and LV

Exp and Lv stand for “execution points and Level of Violence” respectively. They go up in number as Frisk kills monsters in the underground. Chara’s power is at least partially corresponding to the amount of Lv they gain, with level 20 being the max Lv they can obtain.

Sans explains the concept of Exp and Lv https://youtu.be/oKcEgBrIvBA?t=1765

Full manifestation/possession

At max Lv Chara can manifest as a separate entity. They can also possess Frisk at high Lv, and retain the ability to posses Frisk even in endings where the genocide ending was reset.

Chara fully manifests as a separate entity https://youtu.be/sC4Q5AvIX3s?t=93
Chara in the void after the genocide ending https://www.youtube.com/watch?v=oUSR4PlN6ns
Chara possessing Frisk in the soulless endings https://youtu.be/BsNec0oSZvM?t=621

Acausality

Unlike Frisk and Flowey, Chara's memories are not reset with true reset.

Genocide and Pacifist ending changes https://www.youtube.com/watch?v=czXiboQFrvg and https://www.youtube.com/watch?v=mi-iQ5o1Nwc

Note: Chara should technically be able to manifest or posses Frisk at any time after the genocide ending has been completed once. As they retain their memories of said route and are the ones that restore reality back to normal if the player wants to perform another normal playthrough.

Feats

In the majority of undertale you control Frisk in battle by maneuvering their soul to dodge attacks. Technically monsters in undertale use magic that’s much more spiritually based, rather than physical.