Those look awesome. One thing I've been thinking about though are the roman numerals, as a lot of ideas have included them, but I am not convinced that they're the way to go.
The issue I have is that their progression doesn't make sense visually. Like, we go from additional lines meaning higher number: I, II, III, to all of a sudden fewer lines meaning higher number: IV, V. It kindof breaks with the whole idea of having more stuff mean higher number. You can see in @tatsu's first submission that the IV has to get squeezed in with a smaller font in order to fit in the same space. Plus when you read roman numerals like IV, you are forced to do math in your head: "lets see... IV means I -> 1 and V -> 5 so I need to swap the order and subtract 5-1=4!". And sure, you can expect most people to just have this memorized because of experience, but I just feel like there must be a more intuitive way to represent the tier than roman numerals.
For example here is a little modification I threw together in a few minutes:
I think it's pretty clear what each of those means without me needing to explain anything, and actually looks pretty good too (ignoring the sloppiness). No need to do math as our brains are naturally able to count objects (up to about 7 or 8 I believe). It could be any object really, stripes or diamonds, or circles; I just thought the 5 pointed star fit nicely inside of the pentagon.
@biass thoughts?