The magical world of Harry Potter is continuing to expand nearly two decades after the final book in the heptalogy. The upcoming TV series is expected to last seven seasons over the course of ten years, allowing the showrunners to authentically replicate the source material. That said, every major action in the narrative is dictated by emotion — and these emotions aren’t always kindness or courage. Some may be guided by a thirst for revenge while others are simply unhinged or do everything out of a twisted sense of loyalty.

Consequently, many characters in the series also display a great deal of selfishness. Nearly everything they do is focused on themselves and their own needs and wishes, even if they sometimes rationalize their actions as being "for the greater good." And while this kind of emotion is just as human as love or compassion, selfishness can have devastating effects on others,...