Matter Absorption – The ability to absorb matter.
The Absorbing Man (Marvel) is a supervillain that first realizes he has this power in Journey into Mystery V1 #115.
The Sandman (Marvel) is a supervillain that can only absorb sand like matter. Sandman can become a giant due to this power but strangely almost never does!
The Blade Beast perversely absorbs blades in Creature Collection II. Dark Menagerie