To be undetectable, like you're describing, would require cosmic-level mind-shield at an obscenenly high-level (probably in the +10 to +20 range) or taking Resistant (Immunity to Mind-Affecting Powers; 30). If the character has those disadvantages, they're going to be detectable. The delusion isn't relevant as the telepath is asking their subconscious that would know who and what they really are. The telepath would be able to determine that it is a delusion that they genuinely believe, but they'd be able to see their true knowledge as well. Cosmic only makes it tougher and lets it do special things, it can't change the base advantage into something else (which is what you're describing).
And, there's a significantly easier way of doing all of this. I have a megavillain in my Super San Diego game who actually does it.
There's no need for a race designed to replace someone (eventually, they'll replace the boss-race, look at Dune if you don't believe me). But, a powerful affliction that gives someone Mindlink (no signature) and an Involuntary, Secret Duty permanently then the AA buys a cosmic stack of Puppet. That way, the AA can switch into controlling the Puppet whenever they want . . . with no resistance roll. That has the other benefit that only the AA requires anything cosmic, instead of an entire race of cosmically-immune nega-psychics.
It's nearly undetectable and now there's no way to determine who they are unless you have precognitive or time-spanning powers. They're not just acting like the person . . . they still are the person.
That was just a logo I found, and it seemed to fit for this. If I were doing it for anything more that just here, I'd have used a real logo.
And, there's a significantly easier way of doing all of this. I have a megavillain in my Super San Diego game who actually does it.
There's no need for a race designed to replace someone (eventually, they'll replace the boss-race, look at Dune if you don't believe me). But, a powerful affliction that gives someone Mindlink (no signature) and an Involuntary, Secret Duty permanently then the AA buys a cosmic stack of Puppet. That way, the AA can switch into controlling the Puppet whenever they want . . . with no resistance roll. That has the other benefit that only the AA requires anything cosmic, instead of an entire race of cosmically-immune nega-psychics.
It's nearly undetectable and now there's no way to determine who they are unless you have precognitive or time-spanning powers. They're not just acting like the person . . . they still are the person.
That was just a logo I found, and it seemed to fit for this. If I were doing it for anything more that just here, I'd have used a real logo.