H is a alien about the size of a human 4 year old. He is 3.3 feet tall. He wears a Plumber Space Suit, without the helmet and has the omnitrix strapped across the chest.
-Small Size : Being smaller than most aliens, allows H to perform maneuvers and move to places that otherwise would be impossible for other beings.
-Antimatter Outline : H's body is outlined by a layer of unconventional antimatter which glows a harsh purple. This layer has special properties similar to the antimatter known to humans. It will not allow any conventional matter or energy to touch it. (For example if he was somehow trapped in a very small room that he couldn't teleport out of, that was also expending, no matter how much force was used to squeeze and crush him, his antimatter outline will protect his body and will form like a force field around his body that will repel all matter and energy like a magnet. However the skin of his body is a milky white form of antimatter that acts exactly as humans expect it to.
-Teleportation : H, being made of antimatter cannot come into contact with conventional matter/energy. He will unconsciously teleport out of harms way. (For example -- https://www.youtube.com/watch?v=BgWQ09pVFi0)
-Lack of Strength : H's species never evolved needing strength since they couldn't be touched by predator or their environment
-Repelling Body : H's body repels all matter and energy. There are many uses for this attribute.
*Technically speaking, since H can't touch matter, he could basically lift anything. Imagine dropping a building or planet on top of him while his hands are over his hands. The object would just hover over his hands and if he moved his hands he would move the object on top of it This can apply to anything.
*H should also be indestructible since conventional matter and energy can't touch or interact with him
-Teleportation Limit : H has no control over where he teleports, and he teleports unconsciously.
-Weight : H has a mass of 100,000,000,000,000,000,000,000 tons due to being made of an incredibly dense cosmic metal from the singularity in a black hole anomaly that is similar to anti matter in the sense that it explodes on contact with regular energy and matter.
-Explosive Potential : For whatever reason, if H's antimatter force field should be destroyed by some unknown means, then the following explosion will yield 3,903,999,999,999,999,600,000,000,000 megatons of TNT. To fathom how much energy this is, this is about 4 times the amount of energy needed to destroy a solar system. = three octillion nine hundred three septillion nine hundred ninety-nine sextillion nine hundred ninety-nine quintillion nine hundred ninety-nine quadrillion nine hundred ninety-nine trillion nine hundred billion megatons of TNT. Jeez. Azmuth locked the DNA of this transformation = he would not allow this transformation to grow like the rest of Ben's aliens. He installed additional failsafe's requiring a password and vital signs to transform into this alien (which Ben removed) and made sure that he hid this alien well into Ben's arsenal. If this alien grew he would have 4 times the mass and thus would be able to destroy 12 solar systems.
-Enhanced Senses : H has enhanced smelling and hearing. He also can see incredibly small things from superhuman distances. He can see gamma rays and when he does this his eyes turn green.
-Flight : H can hover via repulsion
-Gamma Vision : H can see in gamma rays which ionize tissues and DNA
-Brutality : H's species has never felt the warmth of a hug, or the sound of a greeting (Ben uses the omnitrix to hear and see regularly similar to Goop's Anti-Gravity Disk) and so they evolved lonely and have lost all emotions. They just sit and contemplate their reality. As H, Ben is completely fine with being brutal or even killing because he also lacks empathy and mercy. They only have feelings that one can feel without external interference like, curiosity, confusion, focus and motivation.
-Gravity Manipulation : If a secret failsafe is removed, and with enough mental adversity, H can open atomic holes in his antimatter suit for incredibly small increments of time. These warp space-time due to insane amount of gravity from the silly amount of antimatter inside of H, though Ben purposely left this failsafe in because the subsequent explosion and attraction of matter is not good for the surrounding solar systems.