Lemme apologize in advance for the necropost (if this is one) but I recently searched youtube for "Suika" and found a ton more videos of here from this completely different game that hasnt been mentioned here or at GTS Depot that I know of. I cant read japanese, so maybe someone else can translate.
http://youtube.com/watch?v=bGzrrh_DahM
Theres many more than this, but this one seems to have the most action and growth. IMO this isnt the same game where suika is the final boss character at least from my glances at it, but possibly a later game where shes a playable character...teh mechanics seem very "Bloody Roar-ish" as the characters cant use their special attack right off the bat as it must be built up over the course of the fight and then you gain the ability to do so (like Suika's Growth) The most intresting part of this video is at the very end where the player using Suika manages to grow a good 3 times in a few seconds, but the special attack only lasts a few seconds and then she shrinks back down again.
Its intresting to see her normal sized attacks as apposed to her very limited move set while in giant loli mode, as we all haev seen from MUGEN. In this game she doesnt appear to be the best of characters however as she seems to get beat on alot.