Here's some ideas for DNA powers from things.
Boneshark-Damage
Warper- Teleporting- You can create portals that lead to random different places different places. Injecting multiple would make the portal bigger so you could eventually get a cyclops through.
Tiger Plant- Spikyness- e.g. If guys hit you it would hurt. Btw tiger plant is spike plant.
Cave Crawler or Blood Crawler- Jump. If you were in water you would rise higher. Maybe the ability to walk on walls/ceilings.
Crash- Explosion knife, explosion stasis rifle, explosion repulsion cannon, explosion seamoth torpedos, etc.
Bleeder- Vampirism- you can get health from attacking other things. Also bleeders would maybe be friendly.
Shocker- Electric defense- Like the seamoth upgrade, but for YOU
Coral Tree- Photosynthesis- Health and/or food/drink regenerates in the day time. Like a solar panel, but for YOU.
Gasopod- Poison- Poison knife, poison stasis rifle, poison repulsion cannon, poison seamoth torpedoes, etc.
Sandshark- Burrowing- You can burrow in the sand just like a sand shark. You could hide from predators or sneek up on peepers.
Reaper leviathan- You get grabby mouth arms that auto grab predators before they can kill you, just kidding
Some of these are a bit OP, maybe you'd have to collect a lot and use the centrifuge which would be hard to make.