MitD XV: The Other Dark One

[Emanick]

I'm wondering: Do you think Serini's orange-voiced companion could be another member of MITD's species? She's said that she "belongs with the monsters" so it would seem more likely that Orange Voice is a "monster" than that it is a member of one of the civilized races, it would set up the reveal quite nicely, and it would be appropriate to the gag to have another member of MITD's species show up on-panel... while invisible.

I think this is definitely plausible. There's no direct evidence for it, of course, but as you say, it makes basic sense, both in terms of plot and in terms of in-universe logic.