All talk of gender confusion aside, some things you need to correct:

Growing and shrinking is a good utility option, just so happens two of your boss summons can do it. If you're really going through with that, specify a minimum size and maximum size and feel free to compare them to any canon summon or character.

For your Snake, detail what the poison does and how long its meant to last. 

Please have your Owl's camouflage be erased or find a limit to it, for instance if it moves the camouflage will disappear. This is a spy tool that needs some sort of drawback, otherwise it's too good. No ones likely to suspect an owl to be an enemy tool in the dead of night anyway, so you already have an unconventional summon at your disposal. I'd prefer you either remove it entirely due to your already incredible advantage with it, or give it a limit. 

"Sage Panther Tsume
Abilities: Can use most Jutsus that do not require hand signs and Transformation. Transforming into a human doesn't give him the ability to use other Jutsus."

Access to all elements without preparation needed. It would be helpful if you listed what exactly this one could do, or at least limit what it can perform to several things.