The weakest part of Nano's design is the model itself, since while it has a
few amusing expressions, the art just feels generic. I think the character comes through better in some of the fanart of her, especially Valefor and Chavez's takes:
I think part of it is that she looks older in these pictures, which helps avoid the initial "oh it's just a generic loli but with rabbit ears" reaction I had when she started using this identity. I think aging the character up would be a good idea in general as her voice and personality don't really fit a younger-looking design, in my opinion.