User blog comment:Dispelling Mage/Omake: Lucy & Migi - Review/@comment-24784846-20150828140659/@comment-7418318-20150828142213

I doubt it'd be a problem for Aya Hirano to voice both, since Migi's voice is to heavily distorted you can't hear the similarity anymore.

Besides, we had Cana and Aquarius, who are voiced by the same person, have a verbal fight before.