Shapeshifting: The Skrulls are able to rearrange the molecules of their body at will into any form, shape or being perceived that they choose.
Mimicry: Skrulls are cunning spies due to their ability to mimic sounds and voices. This is mainly used in conjunction with the shapes they shift into.
Weapon Formation: Skrulls are able to use their shapeshifting abilities to form weapons with parts of their bodies. For instance, they can shape their arms into blades or clubs. This ability makes them dangerous hand-to-hand combatants.
Symbiotes can control the actions of their hosts at a certain point.
Symbiotes that have fully bonded with their hosts have a more biologically complex symbiosis with their hosts, and can share thoughts and memories with them. Carnage has also been known to hide in its host's blood stream.
The symbiotes are said to have 'genetic memory,' and can read the memories of others of their kind by absorbing chunks of their material.
Symbiotes tend to be dense, and can absorb even the force of bullets before they reach their hosts.
All symbiotes have the ability to form tendril-like psuedopods. Venom has used this to great effect by forming weak tendrils and shields from his constituent matter. Carnage discharges tendrils of his constituent matter instead of webbing. Scream has numerous tendrils composing her costume's "hair", which she has used as a powerful whip.
Terrestrial symbiotes additionally have the power to form solid appendages from their bodies, and have been shown to form spikes, talons, and blades.
The Life Foundation symbiotes have also been shown to form a powerful acid from their constituent matter.
Symbiotes have the ability to process breathable gases when the host normally cannot breathe.
Symbiotes can expand to any limit in order to cover any host or object.