TEMMIE the TEM!"
– Temmie introducing herself.
Temmie is the first major character that the protagonist encounters in UnderSwap, serving as the main antagonist for the majority of the game, like Flowey, specifically the Neutral and True Pacifist routes. She provides an introduction to the mechanics of encounters by sharing "Temmie Flakes," which are actually harmful bullets, again like Flowey. Her main philosophy is "KILL or BE KILLED.”
Temmie has the apperance of an conscious stuffed animal. His structure that resemble cats, with dog ears on the side of his head as well as normal cat ears, shoulder length black hair, blue shirts.
Initially, Temmie operates under a facade of friendliness and politeness. He often greets the protagonist with southern slang, such as "Howdy!", calls himself "your best friend," and, like his father, appends polite words such as "gosh" and "golly" to the ends of his sentences. Whenever he drops this guise of friendliness, he often calls the protagonist an "idiot.". . Temmie has a malevolent and cruel disposition, berating the protaganist's for not following his "kill or be killed" philosophy. Despite this he also criticizes the protagonist at the end of the Ruins if they any monster. He is manipulative,devious, and a cunning planner and subtle if the circumstances require it. He retains his memories between SAVEs because he was once able to SAVE. He is also known to be extremely cowardly, as he kills his mother to appease the protagonist in a vain attempt to save his own life in the Genocide Route's conclusion.
H is extremely weak despite her appearance. When enraged, she has only 1 attack: "Temmie Flakes". They are very weak, and only do 1 damage per hit.