Oh how interesting. Capcom specifically choose blue because the NES pallet can display more hues of blue than most other colors. It must be a pain for you if you're color blind to blues.
As for Powered Up, Roll was one of the best parts of that game! If you run a google search, you can find save files of people who did nab Roll. Download them hook up your PSP and transfer the sale files over - instant access to Roll.
Not only is she hilariously powerful, her banter with the other robot masters and especially Wily is hilarious.
plus all her outfits are adorable. Every time I go back to play Powered Up, it makes me sad that Capcom didn't continue with the chibi style remakes of the classic series. Imagine the same sort of game for Megaman 2, playable robot masters, stage editor, unlockable playable rock with slide and charge shot, Roll, Protoman... Capcom could and should have done that for each game through Megaman 8. But due to poor sales and how easily PSP games could be pirated, that sadly never was to be.