For each group of Characters presented to you, click one or more of your favourites from that group and press the "Pick" button. Eventually, your favourite characters will start appearing under "Found Favourites". You can continue as long as you like to construct an arbitrarily long list.
In principle, this picker is perfectly accurate, provided you pick consistently - you'll correctly get your second favourite second, even if it's pitted against your absolute favourite early on, for instance. You can reorder your favourites after you've found them by clicking and dragging, but in principle you shouldn't need to.
Obviously, this can also be used to pit characters against each other in any arbitrary competition. Go nuts.
More information about all of these characters can be found here.
Powered by Dragonflycave's Favourite Pokemon Picker.