Psionics users (a.k.a. psychics) use a different type of power from traditional magic. Their powers are based on affecting their surroundings by exerting their mental powers to affect physical objects or other minds surrounding them. Generally, psionicists don't deal with the plethora of other planes that make up the universe. If they do, it'll be the Astral Plane, mind dimensions and dreams, and, on extremely rare instances, siphoning energy from the evil and good, and positive and negative planes.
Your tradional arcane and divine magic user is able to summon allies from other dimensions from other planes, pulling a physical creature out of their home plane onto the Material Plane. Psionicists can't do that.
But some psionicists achieve a close second. They can bring in ectoplasm from the astral plane and condense it to take on a solid, quasi-alive form for a few seconds or minutes. These are called astral constructs.
Some especially talented psionicists are able to make their astral constructs take on forms suited for specific tasks. The agile loper type of astral construct is made for speed and charges. The ectoplasm around the "head" is under great pressure, forming ultra-dense, very hard horns to knock down opponents so the construct can trample them underfoot.
Back to constructs!
This isn't a conscious choice, mind you. When I can't think of a creature I particularly feel like drawing, I use a system to randomly select one out of the monster manuals. I just happens that that same system sometimes gives me similar types several times in a row.
I really want to try out a game with psionics, but I've heard that they're notoriously unbalanced. Maybe if you run a game that only has psionics and no arcane / divine magic? I don't know.
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