u/BaneNF

My personal head cannon

Lasher: is more heroic leaning than most of his siblings and the most flexible with his shape prefer to stretch and use tendrils as opposed to the usual punch kicking

Scream: is the most unstable of her siblings due to her paranoid personality and she prefers to use her hair for combat

Riot: is the physically biggest and strongest of his siblings and has the personality of a bully he prefers to use physical intimidation to get what he wants

Agony: is the most intelligent and tactful of her siblings she prefers non-aggressive solutions but has a very short temper and is prone a angry outbursts she is also the most empathetic for her siblings

Phage: is the most cowardly and conniving of his siblings he prefers to avoid combat all together and is often the first to run from a serious threat he is also the least loyal to his hosts often abandoning them or using them as means to an end

Sliver: got a lot of traits from Black Widow such as combat and espionage skills and a moral compass however she's more controlling of her hosts when it's not Natasha herself

Flicker: is the most skilled at camouflage/invisibility (not sure how/if Flicker counts but I included her just because)

Sleeper's just here for the sake of completion he's already fleshed out and characterized