Eeeeeeh SC5 games have their own retro-sci-fi style which kinda looked a bit plastic givne the design. PSO2 has more of a sleek sci-fi design that would clash a little between the two. Only way I can imagine Ulala in PSO2 would be if she was remade in PSO2s character creator.
Make the PSO2 character thrown into the SC5 world.
So it's kinda like time travel thing.
Modern looking gut thrown into the retro looking environment.
Or remade the SC5 Chars.. But design-wise it would be lot of work...
https://www.youtube.com/watch?v=p8T7aqg2VmM
No wonder the name feels familiar.