[Switchblade]

Personally, I think a Rider's final form should come with some kind of cost for using it, ideally the higher the better. I like that Kuuga was afraid to use Ultimate Form because it might totally overwrite his personality. I like that Blade couldn't overuse King form because it would turn him into an Undead. I even liked seeing Wizard run out of energy because Infinity form guzzles his mana really quickly. The drawback or danger in the form makes it more dangerous to use, which means the Rider has to keep it in reserve for only the most dire of circumstances and, when it is used, we know that this is a moment when the gloves have to come off. Otherwise you just get something like Emperor Kiva, where the base forms just get dropped and half the series is just the final form. Overuse really robs a final form of its power and grandeur.