I was thinking about this earlier...pardon my gushing, hahah. xD I think it's because Sans, like a lot of characters in Undertale, is very well-developed and his personality is entirely believable and, actually pretty realistic. I think it's the enigma, too, and all the emotional baggage he hides behind a veil of laziness. Kinda. As someone on gamefaqs put it: definitely someone you'd want to go drinking with. Also I guess his traits are like, desirable as in a long-term relationship thing? xD I dunno, tbh his demeanor almost reminds me of David. Kinda. Like, not some stereotypical pretty girly-man anime dude. He's realistic, and it's really refreshing.
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