I can tell you the facts.. but if you go http://paragonwiki.com/wiki/Demonic you know the scource of my knowledge 
Yes... they can....
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Quote:
Yes you can get the badge and yes you keep the power. However, when you return to Hero side you cannot actually USE the power.|
Originally Posted by Ghost_Ripper
Can heroes that go villian get the Demonic badge and accolade power? If yes, then do you get to keep it if you go back to being a hero or vigilante?
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However, if you do not have Archmage then when you return to being a hero you will be automatically granted that accolade and the associated accolade power when you switch back. So the important thing to take home is that once you earn the accolade power (on either side) you will always have access to it but you cannot have access to both versions of an accolade power at the same time.
Can heroes that go villian get the Demonic badge and accolade power? If yes, then do you get to keep it if you go back to being a hero or vigilante?