Toxic people look for people who have little to no boundaries. They look for people they can persuade or take advantage of. They're also known to test a person's boundaries and see what they can get away with.
They tend to look for "Ride or Die" individuals. People are who are extremely loyal no matter what.
They look for good people they can manipulate or take advantage of. They use guilt or other maneuvers to control them.
They also look for people who are great but don't know how fabulous they are. They want to be involved with great people but because of their jealous tendencies, they also want to destroy them.