None of the above are paradigms of UX and design, but they are just to give you a sense of what I have been working with to date. You can take as much (or as little) inspiration as you wish.
I won't explicitly share what I think is good or bad as not to bias your study, but would love to talk more on what you observe as good or bad in all.
One final note I will mention is that one of the largest focuses of our design beyond just being objectively clean and attractive, should be approachability. Access does not mean inclusion, and there are examples of products that have performed well purely because they have delivered the same offering in a far more approachable manner.
A lot of the features that exist on Robinhood were already available on incumbent investment platforms, but they were too intimidating to capture the market share that Robinhood now has (in part, there were of course other factors). So every aspect of the design should be built with this in mind.