Things like Lightning, which electrifies enemies, with very low damage against enemies, but electrified enemies shock nearby enemies, dealing high damage, making it a good croud control weapon. Or Acid, which slowly corrodes away at enemies, with increasing speed the more acid is applied, but again, dealing low amounts of damage in the actual impact of the shot. Possibly even a Magnetic type, which deals decent enough damage but with the added benefit of magnetising any metal enemies, causing them to behave like a magnet part, attracting other metal enemies, broken ship chunks, or meteorites (or even bio barrels if one isnt careful).