Lexus has some unique models. Their F lineup is pretty interesting. I think those count.
and correct me if I'm wrong, the first gen tC was a unique model to Scion. I've read it was based off the Avensis platform, but is a completely different car. Actually, weren't the first gen xB and xA unique models to Scion also? I don't know about them.
I think the current tC shares platform with the Corolla, the xB is going away, so is the iQ, and the two new models are a Toyota Auris (iM) and a joint venture with Mazda (iA). Lame.
Let's just hope one or both of the twins gets a turbo setup so it can refresh the model. Maybe they just offer a turbo version and an NA version with a price difference, I don't care. I like the twins and hope there's always some variant of them for sale.