Temmie is the first major character that the protagonist encounters in Underswap, serving as the main antagonist for the majority of the game, specifically the Neutral and True Pacifist routes. She provides an introduction to the mechanics of encounters by sharing "Tem Flakes," which are actually harmful bullets. Her main philosophy is "KILL or BE KILLED.
Temmie resembles a cat with dog ears on the side of her head as well as her normal cat ears on the top of her head. She has shoulder length dark black hair, and a purple and blue striped shirt, which suggests it can be the tem shopkeeper that got swapped with Flowey, because the tem shop keeper also wears a striped shirt, even though the colors of the shirt are different. She also appears to have white fur and a small tail. She is usually shown with a calm, friendly expression, grinning at the protagonist. Temmie can have over 45 facial expressions and can mimic the the faces and voices of other characters.
Initially, Temmie operates under a façade of friendliness and politeness. She pretends to be "stupid". Temmie often greets the protagonist with "hOI!", calls themself "your best tEM," and, like her mother, appends polite words such as "gosh" and "golly" to the ends of their sentences. Whenever Temmie drops this guise of friendliness, they often call the protagonist an "idiot."
Temmie has a malevolent and cruel disposition, berating the protagonist for not following her "kill or be killed" philosophy. Despite this, she also criticizes the protagonist at the end of the Ruins if they killed any monster. Temmie is manipulative, devious, and a cunning planner and subtle if the circumstances require it. Temmie can retain her memories between SAVE's because she was once able to SAVE. She is also shown to be extremely cowardly, as she kills their former mother to appease the protagonist in a vain attempt to save her own life in the Genocide Route's conclusion.
Temmie introduces the concept of the bullet board and calls her bullets "temmie flakes."
- If the protagonist dodges three times, her friendly act slips and she hypocritically snaps at the protagonist for toying with her.
- The background music lowers by one semitone each time the bullets are dodged, before slowing, lowering pitch, and stopping entirely.
- Before her third attack, Temmie screams "RUN. INTO. THE. BULLETS!!!" before quickly looking directly at her text and changing the "BULLETS!!!" in the speech bubble to "temmie flakes."
When the protagonist runs into her bullets, she announces her central philosophy. Regardless of whether the protagonist dodged Temmie's bullets or not, she then attempts to kill the protagonist with an unavoidable ring of bullets, but Asgore intervenes and saves the protagonist.
If the protagonist killed Temmiie on a previous Neutral Route, she does not appear. If the protagonist spared her, she reminds the protagonist not to kill anyone. If the protagonist gained no EXP, she reminds them to befriend everyone. After resetting a Neutral Route multiple times and repeating Temmie's initial encounter, she becomes annoyed and questions if "you have anything better to do."
If the protagonist resets a Genocide run before or after killing Papyrus, Temmie says "Really, <Name>? Well, do what you will. I'll be waiting for you!" before leaving.
At the exit to the Ruins, Temmie judges the protagonist's actions up to that point. Temmie does not appear to judge the protagonist if she was killed in a previous Neutral Route.
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If The Protagonist Spared Asgore
If The Protagonist Killed Asgore
If Genocide Route Requirements Are Met
If Asgore hasn't been met
After the Ruins, Temmie will be seemingly absent until the end of Toriel's battle. However, backtracking in some rooms allows the protagonist see Temmie burrowing back into the ground on the edge of the screen.
Temmie also leaves a message on an Echo Flower in the vertical room before the bridge in Firerise that changes if the protagonist spared or killed Asgore.
If the protagonist decides to kill Toriel, Temmie appears, destroys Toriel's SOUL, and absorbs the six bottled human SOULS. If the protagonist spares Toriel, Temmie appears and kills Toriel herself. Then, the game crashes and Temmie's battle begins.
After she is defeated, the protagonist has the chance to spare or kill Temmie. Temmie requires the protagonist to offer her mercy multiple times before she flees, unsure why the protagonist is being nice to her.
If the protagonist loads or finishes another Neutral Route, Temmie does not absorb the SOULs because she knows that they would rebel again.
True Pacifist Route
Temmie will absorb the SOULS and turn into Monster Kid
During this Route, Temmie will finish Toriel off, by destroying her SOUL using Temmie Flakes. She will the beg the protagonist not to kill her, while mimicking her old self. She will still die. After she has been killed, the protagonist will meet Frisk.