Undyne

Undyne is a fictional character in the 2015 video game Undertale and episodic video game Deltarune. In Undertale, she is a monster who serves as the captain of the Royal Guard of the Underground under its king, Asgore. She is initially an antagonist to the player character, but depending on the player's actions over the course of the game, she may become their ally, their rival or their nemesis. If the player makes a point of killing every monster possible, Undyne will transform into Undyne the Undying upon death, vowing to destroy the player in order to save all other life from their actions. She is a lesbian, revealed to be in love with Alphys.