My maga character will, soon enough, be looking for a familiar and I thought I'd ask the forum for ideas as I can't think of a fitting animal.
She is a Muto Mentem specialist, who is focused on changing herself to become a being of pure spirit (pure mind).
The most fitting animal theme-wise seemed to be the Silk Worm, spunning delicate threads around itself until it disappears (as per the 4e Bestiary)... somehow, a silk worm doesn't seem as a, ehm, respectable familiar.
I suggest a bird, like the spell Inmost Companion, MuMe Level 40. I'd do some kind of dove, since their cooing is often soothing to the mind, and magical doves often have Mentem powers. Or perhaps a nightingale or mockingbird, a type of bird that has a magical ability to speak?
Or, to go a different route, you could do a spider, perhaps one like the ones the Tremeres keep in True Lineages?