He can pull off some really cool thing by adding multiples of power on top of each other.He can take the mass of a Brontosaurus(100 tons?) and then take the strength of a Rhino Beetle (Can lift something like 850x it's own weight), so then he's be able to lift 850x the weight of a brontosuarus.
Then he can take on the durability of a roach, and add it to the mass of a bronto, and yada yada...speed of a hawk...yadayada.
•Copying jellyfish could give him a venomous touch;
•Copying sponges could let him reform after being torn to bits;
•Copying octopi could let him get pounded flat and recover, or squeeze himself through tiny holes;
•Copying fireflies/squid could grant him light emission powers;
•Copying sharks/rays/platypuses/eels/whatever could grant him generation and perception of electrical fields;
•Copying dolphins or pigeons could grant him perception of magnetic fields;
•Copying bees and pit vipers could grant him IR and UV vision;
•Copying Pompeii worms (the ones around underwater volcanoes) could grant him resistance to heat;
•Copying antarctic cod or certain crickets could grant him resistance to subfreezing cold;
•Copying tardigrades could let him go dormant and survive heat, cold, radiation, dehydration, asphyxiation, for hundreds of years;
•Copying Japanese honeybees could let him increase his body temperature at will;
•Copying painted turtles could grant him immortality (in the not aging sense);
•Copying a dog or wolf could grant him Batgirl-like movement-reading abilities;
•Copying a pinyon jay could grant him superhuman spatial memory;
•Copying a dolphin could grant him superhuman auditory memory and superfast sound-analysis abilities;
•Copying a sperm whale could let him project focused sonic beams;
•Copying spitting cobras or bombardier beetles or cone shells could lead to--well, I'm not exactly sure what, since he doesn't usually change physically when he copies an animal, but somehow he'd be kicking peoples' asses from a distance. Although in a fairly gross fashion.
Buddy has also done the following
-Perception and reflexes of a fly(10x human).
-Combining a dog's sense of smell with a minnow's ability to smell with their entire body.
-Build up a bioelectric charge.
Some other interesting things its conceivable he could do...
-A shark's ampullae of lorenzini. Capable of detecting a drop of blood in water three miles away, and can sense electromagnetic fields.
-Radar sense from a bat(though he may have already done this).
-Pheromone control. Combine that with elephant infra-sound and toads' hallucinogenic secretions and you've basically got close-range mind-control. Screwing with enemies' emotions and perceptions...
-Sound mimicry
Assuming the recent reports of "tabletop fusion" are correct, Buddy could copy either a snapping shrimp or a mantis shrimp, and gain the power to trigger nuclear fusion by punching it.
Wiki says: "When the air bubble implodes it momentarily reaches temperatures of several thousand kelvin, comparable to the temperature of the outer layer of the Sun."
hehe
Rhizocephalans! (Shell-less barnacles which parasitize crabs) The power to change targets' sex at will!