I'm speaking in context to this particular game. No plus frames on normals and specials(purple rain aside). No staggers in the +3 to -3 range. His f3 is -1, but I don't consider it a string. 133 is -3 but that is the full string.
Rain basically takes his turn and then gives it up. Rain's best stagger is -5 from b1. If the opponent isn't half asleep they can poke that out.
That is what I've noticed so far. I really don't understand what they thought his strengths or even singular strength is. In the stream they spoke about how he would have incredible "combo flexibility" but aside from
Bubble, you're pretty limited to 1-3-3~DB1 (I forget what this one is called -- I think "Geyser Stream") 1-3~
amp. Geyser Kick and 2-4-2~
Geyser Kick -- which let's face it, is not totally reliable online 100% of the time.
My execution is not great with him yet but I'm really scared that -- at his highest level -- he will be among the worst characters in the game, no matter the variation/setup you choose. I hate to cry "buff" already but if I were a betting man, I'd say that
in his current state he will likely be regarded as a bottom-5 character and that absolutely breaks my heart.