What Does the Blue Soul Mean in Undertale When Fighting Sans

In battle, the protagonist is represented by their SOUL: a red heart. Yet, many enemies in the game can modify the SOUL'south colour and alter the way it behaves. These are the SOUL Modes.

Each SOUL Mode corresponds to one of the SOULS of the Eight Humans, excluding the one used in Mad Mew Mew's fight.

Red

While the SOUL is ruby, information technology is in Normal Style and behaves normally. It can move in any management at a constant speed, and tin deadening downwards past holding [X] or Shift. The SOUL'south heart sprouts legs when it runs away from a battle.

Scarlet is the truthful mode and color of the SOULs of Frisk and Chara, the eighth and get-go human, respectively.

Blue

YOU'RE BLUE Now. THAT'S MY ATTACK!

Papyrus

When bluish, the SOUL is in Spring Mode and affected by gravity, much like a side-scrolling/platformer perspective. This SOUL color is used by both Papyrus and Sans in battle and is the starting time fourth dimension the protagonist's SOUL changes color. Dissimilar Papyrus, Sans appears to have much more than control over this, existence able to strength gravity in all four directions rather than just straight downwards.

Pressing a direction contrary to the force of gravity causes the SOUL to "bound" in that direction. The tiptop of the jump is dependent on how long the direction up is held until the maximum superlative is reached, which can depend on the attack. In fact, near the end of Papyrus's terminal attack, the max superlative is so peachy that property the jump can cause the SOUL to ascension beyond the normal elevation of the Bullet Board, which extends upward to make room.

Bluish is the manner and color of the Blue Human, who is besides associated with ballet, dancing, hopping, jumping, twirling, rhythm, music, and integrity.

Dark-green

As long equally you're GREEN you CAN'T ESCAPE! Unless you learn to face danger head-on…Y'all won't final a SECOND against ME!

Undyne to the protagonist, at the commencement of their battle in the Neutral Route

While greenish, the SOUL is in Shield Mode and cannot move, but wields a shield-like spear from Undyne that protects the protagonist in whichever direction is pressed. Instead of dodging a blueprint, the protagonist must block arrows coming in from all 4 directions using this spear. This SOUL color is used by Undyne, who switches the SOUL between green and red using her spear. It is incommunicable to flee in this mode. Undyne gave the protagonist the spear in an effort to force them to face danger head-on.

Dark-green is the mode and color of the Green Human, who is also associated with Green Attacks, shielding, frying pans, cooking, healing, and kindness.

Purple

... I recall purple is a better look on you! Ahuhuhu~

Muffet

When purple, the SOUL is in Trap Mode and can only motility left and right on a line and switch between lines using up and down. Spiders motility on these lines that the protagonist has to dodge, acting equally a web. When in this mode, the SOUL cannot ho-hum down by holding [Ten] or Shift. This SOUL color is used by Muffet later on she fills the Bullet Board with purple liquid on her kickoff turn.

Purple is the mode and colour of the Purple Human, who is also associated with traps, note taking, problem-solving, analysis, intellect, and perseverance.

Yellow

You see that yellow push button...? [...] Now press [Z]!!!

Alphys introducing the protagonist to xanthous mode

While Xanthous, the SOUL is in Shooter Mode and is flipped upside downwards similar a monster'due south SOUL, and so its heart'due south signal is directed toward the foe. Pressing [Z] shoots a projectile that tin can destroy sure oncoming projectiles or set up off bombs, as well every bit damage the enemy in certain situations. This SOUL colour activates after the protagonist presses a push button on the telephone Alphys gives them and is only used against Mettaton and Mettaton EX besides as the Lost Soul variation of Alphys.

Xanthous is the mode and color of the Yellow Human, who is also associated with guns, bullets, sharpshooting, accuracy, and justice.

Blue/Ruby

On the ceiling above the door, at that place's an image of two analog sticks being pushed apart.

Flavour text upon inspecting the door to Mad Mew Mew's room after being unlocked

This SOUL color is used exclusively by Mad Mew Mew in the Nintendo Switch version of Undertale. While Bluish/Red, the SOUL is split up into red and blueish halves. When in this state, the left analog stick moves the cyan half and the correct analog stick moves the red half. Depending on the attack, the halves tin either move linearly left or right or in iv directions (up, down, left, right).

Different all of the other SOUL modes, this color is used to represent the signature neon blueish and neon red colors of the Nintendo Switch'due south Joy-Con controllers.

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