Howdy, Beast. Enjoyed reading your work.
Take this for what it's worth, because 1) I am new to 6th edition and 2) I am a crusty and conservative GM. I love your creative and thoughtful use of stretching (offensive multipower slot 6, portal punch).
But I am pretty mystified by the following slot (portal fast strike). The text and rule use is a little confusing. If I were your GM, I would make you buy powers outside of the multipower that add to the stretching slot in order to perform martial maneuvers at range.
Similarly, if you are going to routinely use small swords via the portals, I'd make you buy an RKA. Here's why. When a super complicated adaptation of one power ends up accomplishing the same thing as an existing simple power, just buy the simple power. Just describe all the complicated stuff ("her arms disappear into tiny portals, and the exits of the portals are right between the shoulder blades of her target!") as a special effect of RKA. Simple, fun, and already game-balanced.
I'm also hesitant as a GM to allow "unified power" limitation. The text on pp 118-119 says it "typically represents constructs where the character needs multiple powers.... to build the aspects or facets of a single power". If I have a PC who takes a lot of powers with "unified power", I'm going to warn him/her up front: "within the next five sessions, you absolutely will face someone who can drain one of your slots... are you willing to give up every one of them when you meet the electron drain monster?"
Finally, the "teleport ball bearings" attack is kind of unbalanced. It's a "you die" power. Yes, it will take a few attack rolls to kill a sturdy hero, but not many characters have the right defense. And "AVAD Does Body' has that great big STOP sign. I'd probably make you define another substance (force fields, lead, strong magnetic fields) that disrupts the teleport in addition to hardened resistant PD or just running for your life.
I feel bad for throwing many speed bumps at you. Great creativity, and of course this is just one random dude's opinion!