How does one shade armor omg.

Could someone please explain to me how “naive, well-meaning individual who just wants to find somewhere to fit in and be accepted meets and befriends a small, yellow, cute, harmless-looking creature that turns out to be a sociopathic, sadistic eldritch abomination with reality warping powers, who worms its way into every aspect of his life and begins to destroy it from the inside out all under the guise of ‘helping’ but in fact doing everything simply because it was bored, lying to him, abusing him, estranging him from his brother, causing the near-death of his closest friend, and leading to said individual adopting a ‘Trust No One’ policy to keep anyone else from having to get caught up in his problems and getting hurt” was a character arc I somehow managed to stumble acrossin the span of a mere 8 months? It’s like the universe is conspiring to kill me with a very specific subset of Feels or something, I swear.Gravity Falls belongs to Alex HirschUndertale belongs to Toby Fox “Flowey Is not a Good Life Coach” was written by unrestedjade