I would not advice to do so! You can mimic two times in one activation. And since the Doppelganger has just harmless and a lousy Df, i would prefer to mimic e.g. Baby Kades Df 7, Teddy´s hard to wound 2 or his regeneration 2.
But i got a question too!
When talking about a totem for pandora, most player recommend the poltergeist or primordial magic.
But what about the cherub? Ok, he can´t become a companion, but i think he got decent stats. I like his love spell and his trigger too.
The poltergeist has a slightly better Df, but because of it´s spells he needs to be up front. And his Ca is not as good as the cherub´s.
The primordial magic is a good caster support but lousy at defense or protecting itself.
So, what do you think of a cherub as totem for Pandora? Or did i miss a rule, that she can´t pick him?