Φιλαργυρία (lett. “love for the silver”, meant as money, lat. “Avaritia”)
Even if the original sin is “Avarice”, you can clearly see how it is meant as “Greed” in Re:Zero, bringing it closer to Gluttony’s interpretation of the Christian philosophy that is in turn read with a different nuance in the novel . Avarice is the aversion towards spending and giving, on the other hand Greed is the insatiable desire to always get more of both material and abstract things like social standing, knowledge etc.. The reason why a development of both of them has been possible is because they’re booth sins: Greed because it is the same as Gluttony; Avarice because man puts the desire for objects that can grant him an ephemeral, temporary pleasure before the virtue of charity. There are needs and desires that are common to all men: everyone’s looking for happiness and wellbeing, the only difference is where each finds their own. Christian philosophy affirms that by being avaricious, the human potential of using reason is nullified, making men more similar to animals, leaving them unable to reach for something higher. The only other possible alternative is in the case where the value of most of things is genuinely not understood and no effort is made towards that end (This will further discussed in the comment “Sloth”). So the insecurity and bottomless void pushes Regulus to search for a higher meaning in vain, self-absorbed obsessions. There is a lot to say about this character, he will be explained in depth in his own comment.