The beginning of Kaddish has the words יתגדל ויתקדש - I know that there is a debate whether these words are Hebrew or Aramaic. Regardless, it looks that these words are in the hitpa'el form (I'm unfamiliar with Aramaic grammar, but, I assume that it has a hitpa'el similar to Hebrew.)
If, in fact it is hitpa'el, it is reflexive, meaning that G-d is applying greatness and holiness to himself. That doesn't seem to make sense. So, what format are these as well as the other verbs after יהא שמיא רבא , having similar format?