Aw, c'mon, Retro. Arcanobiologist! She studies the very stuff of myth, and weaponizes it! People are always like "well why is this rogue particularly a Wondy rogue," and motivation is a huge, huge problem for most of them, and Poison is just completely ready-made on both those points. Why is she a Wondy rogue? Because Diana's the only one who knows what's going on when she does something! What's her motivation to come into contest with Diana? Diana is mythstuff, the very resource she uses and the very epitome of her field of study! I mean, Luke didn't do much of anything special with her, but think of the potential. The weird plagues she could create, the bizarre shit she could wake up and set loose on the world either deliberately or as a side-effect of her study, the potential to really explore the intersection of science and magic in the DCU in a way that no other character has ever touched.
Though the whole "Granddaughter of the original" is a major turn-off. If we could quietly excise that I'd like her much better.