While there are plenty of one-off specials I'm not aware of, and have since become aware of since to this thread, there aren't many series production cars I've not heard of at some point.
However, I discovered a new one today - the Toyota Sprinter Marino / Toyota Corolla Ceres.
It shouldn't surprise me really - it's one of absolutely dozens of 1990s Japanese cars that were offshoots of more common lines - people think platform sharing is a relatively new thing but it seems like each major Japanese platform spawned a dozen different cars back in the 90s.
This one, as the name suggests, was essentially a related to the E100-generation Corolla, which was pretty much a different shape in every market it was sold in.
What's quite cool about the Marino/Ceres is that it's an early instance of the "four door coupe" thing that's so popular today (although not so unusual again for Japan at the time - the Integra and the Mazda Lantis were basically the same idea), and it was available with both the 4A-GE 'Silver Top' and 'Black Top' engines during its existence.
Difficult to find videos etc of the car though. They seem inexplicably popular in Russia. Would love to import one of the fancier versions to the UK. Would be an ideal counterpart for the Eunos.