I'd personally like a different tattoo better than the one from the Circle of Knowing. For a good reason: we still don't know much compared to them it seems (Just look how Louisoix was! Freaking incarnation of the Twelve's power).

Either a meaningful tattoo/scar related to Dalamund, unique eye/hair colour or featured jewellery like the forehead gem or some earpiece would be nice!
...unless they have something better in store for us (I could think of more, like notched ears, ...).