The "Suckers" are Alessandra, Scott, and Van Helsing, and the "Legends" are Nash, Baretta, and Van Helsing. Sadly, they can't really be done, since Van Helsing doesn't join your party permanently until after "the point of no return". Theoretically, they could both be done if you waited until after defeating Rixian to take on Van Helsing's sidequest (since that's when Alessandra can join), and then took him in your party to fight at the Drembacher Tournament, but I'm not certain if it can be done. I might have to test this one day.
EDIT: Nevermind. Only "Legends" could possibly be done, as Van Helsing is scripted to disappear after defeating Rixian, and won't appear again after "the point of no return"... Yeah, he kind of dropped the ball on that one...