>>93182588Environmental manipulation, but you can only manipulate matter/energy that you've consumed.
If you're eat ice, you can manipulate cold/snow/ice. If you're swallow air, you can manipulate air, creating powerful gales and giving yourself flight.
Drink oil? Oil manipulation.
Swallow a rock? Geomancy.
And so on.
Drawback being that it takes time to switch elements, and until you are fully switched you don't have complete immunity to the matter/energy in question. Enhanced constitution allows you to consume and resist more dangerous materials like lava and acid, but if you don't, continued exposure to such dangerous matter/energy will begin to harm you much as it does a baseline human.
You can take a blast of fire to the face or a lightning bolt, but if you're hit hard enough and continually, it will eventually bring you down.
So basically Matter Eater Lad, but he gains abilities from the matter he eats instead of just eating quickly.