Well Roma, henceforth known under the Magical name Moonlight Tsubasa, is obviously an antagonistic character whose ultimate goal is a most desirable conclusion to the careers of active Magical Girls. But she’s less Stain from MHA and more Hellgirl, cultivating them from afar to the peak of heroism before devouring them. Metaphorically. 

And given she’s someone they want forgotten she’s not known on sight as a threat. So she or an intermediary would be found spending a long time watching girls at the food court in the hopes one peeks her interest.

While she doesn’t outright hunt the Pageless she’s liable to follow magical girls out on missions and intervene to help them to establish a rapport as she gets to know them.

Currently her eye is on Lucette as the Sempai energy is super strong with her.