User blog comment:BalrogLune/Ultra transformation?/@comment-6532857-20141227173303/@comment-6532857-20141228023333

Sort of, yes. But they're not separate entities, just separate natures, unless they are split. Even then, in Taro, Mother of Ultra needed to split Kotaro from Taro. (At least, if I remember correctly. I haven't seen that show for a LONG time.)

As for the religious analogies, I they're the only things to compare the works to. Yu-Gi-Oh! didn't seem to fit, although I suppose you could compare Yami-Yugi.

In Max, we do see Kaito becoming Max, but in Ginga (and in Saga) we see the host inside the ultra. From this, I draw that with some ultras (Cosmos, Dyna Maybe? Not sure about that one. Only seen the first five eps of that series and the movies he's in Ginga, Seven X, Victory, ect) it is a swapping of places, but with most of the early Showa ultras (those that aren't their own host) as well as Max and Nexus, it's a more mystical bond. In Tiga it's a bunch of complicated reincarnation. If I remember, Daigo is a reincarnation of his son, who was Tiga, who was a reincarnation of someone else.

The simplest ones are the ones where it's just the ultra in human form, and transforming he becomes his true form. Then there's the ones where he chooses a host and they swap places. And then there's a deeper bond where they are each-other. And then there's the reincarnation.