Breaking my silence, Dr. Ratio and Acheron.
The title is mostly a joke, but here's why I think Dr. Ratio and Acheron are definitely related in some way.
I'm only going off of appearance and names because I didnt read the lore enough yet.
Not only do they look like twins with their haircolor and eyes, but both Veritas and Acheron are greek words, Veritas being the Goddess of Truth and Acheron being the personification of the river Acheron.
Acheron comes from the word Achos, which means grief, pain or woe. I dont read much in game, so idk if this whole theory is common knowledge already.
They both have purple hair with white/ grey accents.
Both of their eyes have similarities such as the strong contrast the bright ring around their pupil have, whereas Acheron's is like this due to it resembling a black hole.
both also have red eye makeup and one eye being partly covered by hair.
Both Ratio and Acheron also both wear a purple crystal on their chests
(far fetched) the philosopher has many similarities to ratio, while the archer bears some similarities to acheron, not only by body, but the philosopher has two blue legs which could be a nod to ratio's pants while the archer has only one blue leg which could be her boot