Shinken-Oh! United Under Providence!
Shinken-Oh has to be one of my favorite giant robots of all the Super Sentai. I am, however, very biased in this opinion, as Shinkengers is pretty much the first Super Sentai I've ever watched from the beginning, having to wait for future episodes to air.
Bias aside, Shinken-Oh has proved a great addition to the long list of memorable robots to grace Super Sentai. Being formed by Origami robots, it also has armament helmets that are both reminiscent of Ohranger and Gekiranger. How future robots will add to it, (Shinken Gold is coming); time will only tell. But so far it's a beautiful combining robot and at the top of my list.