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What I really like about Undyne is what she can potentially say to the player before the fight begins for the first time. Most people go the neutral pacifist route and get her lines about being a goody two shoes to deceive people but if you've killed at least one monster for whatever reason she WILL get on your case about it. Even more so if it was Papyrus.
My ex-oshi killed a few monsters along the way and he got so pissed when Undyne told him off, kek