SirLOL Ask: Symbiot Samples and where to get them?

Slashers are either the black and blue small ones you first encounter, or the small white and red ones. I forget which one, but they can be found early.

Vulture, like the name suggests, can be found a little later and they are usually in the air.

Electroling will appear as you advance and, naturally, they shoot electricity. They can be found before and after fighting their boss on the ground near polls.

Grapler are the big black ones that almost resemble Venom. Same goes for the slashers, but they are slightly rarer to encounter.

And Berserkers nearly look like Carnage on steroids. The only way to encounter them is close to the end of the story after SHIELD is being attacked by them. They are usually found on the ground, but sometimes they are hard to find.