hOI!!! i'm tEMMIE!!
Temmies resemble cats, with dog-like ears on the side of their heads as well as their normal cat ears, shoulder length black hair, and blue shirts, excluding the Temmie Shopkeeper, who has gray hair and a striped blue and yellow shirt instead.
All Temmies share an erratic manner of speech, where they often exclude letters, mix lower and upper cases, make inconsistencies, etc. There are some exceptions, however; Bob always speaks in perfect English, the Temmie Shopkeeper speaks in fluent English when the protagonist refuses to sell an item she wants, and regular Temmies in-battle speak in somewhat proper English when denied Temmie Flakes.
In battle, Temmies find the protagonist to be adorable and refer to them as such despite attacking them. However, they also find muscles to be disgusting, as evident by their negative reactions to the protagonist's flexing should they choose the "Flex" option. Because of this, when Aaron, a monster who has tight muscles and an obsession for flexing, appears as a result of the "Flex" option, Temmies are so put off by them that they flee on sight shortly after.
- One of Temmie's attacks is a tall Temmie shape that stumbles about on the Bullet Board; the protagonist must remain underneath (or above if out of legs) to avoid taking damage. In the attack, Temmie sluggishly tracks the protagonist's movements, so care must be taken not to move too fast, or she will move off the board entirely, resulting in unavoidable damage.
- If Temmie is denied Temmie Flakes, Temmie gets annoyed and exclaims "can't blame a BARK for tryin'..." while Grandpa Semi plays. Afterward, the SOUL appears in front of the attack Temmie, and damage can only be avoided by quickly moving to the top of the Bullet Board (the head is harmless; only the legs and body deal damage).
- Temmie's secondary attack involves elongating one of her legs in an attempt to wrap it around the protagonist's SOUL. This attack can be avoided by tracing the edges of the Bullet Board until the SOUL is in the middle, and the leg will contract.
- To spare Temmie, the protagonist must talk to her or feed her Temmie Flakes.
- Flexing at Temmie results in her departure and is soon replaced by Aaron. Notably, this Aaron can be spared by flexing once as opposed to thrice.
- Sparing Temmie using any method rewards the yellow text in the True Pacifist Ending Credits.
- fhsdhjfdsfjsddshjfsd [Neutral]
- hOI!!! i'm tEMMIE!! [Neutral]
- awwAwa cute!! (pets u) [Neutral]
- OMG!! humans TOO CUTE (dies) [Feed Temmie Flakes]
- NO!!!!! muscles r... NOT CUTE | NO!!!!! [Flex]
- NO!!! so hungr... (dies) [Feed Temmie Flakes, if the protagonist has no Temmie Flakes in their inventory]
- FOOB!!! [Feed Temmie Flakes, if the protagonist has Temmie Flakes in their inventory]
- can't blame a BARK for tryin'... [Feed Temmie Flakes, if the protagonist refuses]
- RATED TEM OUTTA TEM. Loves to pet cute humans. But you're allergic! [Check]
- Special enemy Temmie appears here to defeat you!! [Encounter]
- Temmie is trying to glomp you. [Neutral]
- Temmie forgot her other attack. [Neutral]
- Temmie is doing her hairs. [Neutral]
- Smells like Temmie Flakes. [Neutral]
- Temmie vibrates intensely. [Neutral]
- Temmiy accidentally misspells her own name. [Neutral]
- How'd you do that? [Low HP]
- You flex at Temmie... [Flex]
- Temmie only wants the Temmie Flakes. [Feed Temmie Flakes]
- You say hello to Temmie. [Talk]
- Temmie Chang is the name of one of the main artists who worked on the game, who makes a cameo in the game through the character.
- Temmie was originally a doodle of Temmie Chang, created as a joke by Betty Kwong. Its appearance was based on Temmie's likes, interests, and personality traits.
- With their strange speech patterns, nonsensical village, and alien demeanor, the Temmies seem inspired by Mr. Saturn of the Mother series. It is believed that Temmies speak in broken English out of choice, as they appear to have the ability to talk normally.
- The goofy demeanor and pattern of speaking of the Temmies is probably a reference to the "lolrandom" style of humor and stereotypically exhibited speech pattern by young teenagers over the Internet, especially in the early 2010s.
- The Temmies speak in a similar manner to how Chip and Dale speak like in the Chip and Dale 2: Rescue Rangers NES game.
- If the fallen human is named "Temmie", the response becomes "hOI!" and allows the name to be used.
- If one idles long enough without taking any action against Temmie or using any items, Temmie's face eventually vibrates away from her main sprite. This resets if an attack begins.
- As of patch v1.001, Temmie's ATK and DEF are replaced with "RATED TEM OUTTA TEM."
- When Temmie does her attack where she stretches out her arm, if the player were to quickly try to feed her Temmie Flakes, and they say no before her entire arm recoils, Temmie's normal face with her other one will be on her at the exact same time.
- An unused song in the Undertale Demo named "grandpasemi" was originally going to be used for a cut character named Grandpa Semi. As of patch v1.001, this is used when the protagonist does not give Temmie the Temmie Flakes they have in their inventory when they are fighting her. The name of the song also changes to "grandpatemi."
- According to one Temmie in Temmie Village, and the text from checking Temmie, the protagonist is allergic to Temmies.
- It is implied that some Temmies are also allergic to Temmies, which explains why the one and only Temmie on the far-right was seen with hives, which the affected Temmie quirkily names "hOIVS!"
- Temmie does not appear to tell the story of Asriel Dreemurr in New Home.
- In the game files, Temmie has unused overworld walking sprites.