>>39598555In a serious note, I believe her purpose in-game besides being a cutesy NPC that guides the player through their first trip on the Paradise, is also to be basically the only mentally sane or non-hostile person in the building after Lusamine goes crazy and the Aether employees side with her villany.
In the original SM, she's the only reasonable character pick, and indeed, the one character that helps the player in hunting down the UBs in the postgame. That, and I suppose she's probably the one in charge of the entire Aether Paradise after Lusamine goes to vacation in >Kantooo
I never played USUM, so I can't tell how much they "nerfed" her role there, but i believe it could be mostly the same, assuming Lusamine is gone after USUM's postgame too.