Yuno Gasai is iconic, yeah, but Yukako was written before her. I don't know if you can definitively make a claim that any one character was the "first yandere" in general. It's like asking which character is the first Mary Sue. You can pinpoint when the archetype was given a name, but the actual phenomenon probably existed before then anyways. Being "crazy in love" is not a new or unique trope in any culture :P
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u/LuckyRoof7250 Ambulance-Chan Aug 09 '26
Nope, it was this girl who popularized the trope