The best that can be said about MitD's species' alignment is that it is unlikely to be Good, since RedCloak would not have recruited a Good creature to protect the goblin village given his rather dim views on the Good alignment.
This, however, is a very weak argument, since it can be argued that MitD was not, at the time, Good. Also, consider that MitD's alignment and his species' need not
match. As such, knowing MitD's actual alignment brings us no closer to knowing his species' alignment and, thus, for the purposes of this thread, this is a barren path of inquiry.
The only exception to this is alignment when applied to morality plane denizens (i.e. angels, demons, etc.). Rich commented on this topic in DStP:
Originally Posted by
The Giant, Round 4 Commentary
It's important to note that this doesn't necessarily make Celia right in her views. Heck, they're not even all that consistent, considering she has been known to fly off the handle and zap people from time to time. Because, see, Celia isn't a deva or an angel; she's not an embodiment of Law or Good. She can mistakes and screw up, and she can fail to live up to her own ideals, as she does later when she finds herself cheering while Haley shoots people. She wants to be a pacifist, but she can get caught up in the excitement of battle the same as anyone else.
Originally Posted by
The Giant, Round 7 Commentary
The entire point of their organization is to blur the lines between the the three fiendish races (demon, daemon, devil) and depict cooperation where normally one would expect backbiting and betrayal. So here, we have a slightly less neutral daemon, a slightly more chaotic devil, and a slightly more lawful demon (one who went to college with devils, even).
From the above, we know that angels and demons (unlike other outsiders) are embodiments of their own morality planes. Yes, they can change their alignment, but only slightly, and when doing so it serves the purposes of their other alignment. And even then, it is a very rare and line-pushing experiment. The embodiments of the morality planes are as follows:
{TABLE]Lawful Evil: Baatezu/Devils|Lawful Neutral: Formians, Inevitables, Modrons|Lawful Good: Archons
Neutral Evil: Yugoloths/Daemons|True Neutral: Rilmani|Neutral Good: Guardinals
Chaotic Evil: Tanar'ri/Demons|Chaotic Neutral: Slaadi|Chaotic Good: Eladrin[/TABLE]