Being ginger is not a protected class, so there is no legal restriction on descriminating (so long as you don’t successfully argue that gingers are a race, eg Scottish, but that’s a stretch).
However morally no, you shouldn’t have a say in it. Either way, usually you’ll be dead when the decision is made. Maybe not with kidneys, although with kidneys you tend to know who you’re giving it to - I don’t think anyone just randomly donates a kidney, like you would give blood.
I really appreciate an Italian who isn't prescious over pizza! Of course, traditional Italian pizzas are great, but that doesn't mean alternatives can't be awesome too!
IMO, so long as the toppings go well with the sauce (eg a fajita pizza should have a spicier sauce) then you can make something great.
I've had (sweet) potato work on a pizza before, the pieces need to be pretty thin to cook properly. The octopus was overcooked on that one and the potato were large chunks and undercooked.