Depending on your skill level pretty much most figures can be adjusted as long as you have a good supply of excellent putty. Given the price, I tend to adjust cheaper figures.
Someone like @JRutman showed excellent dioramas on here using figures that had been brilliantly adjusted from the original. If you search for some of his work on here it should show you what’s possible.
There is also a campaign on here on figures;
Might be useful to see some of the methods to alter figures.