Siegfried
is able to be your first choice to Fight in the beginning, he is cheap but can fight one enemy along the line.
He costs 100$ has 100 Health and deals ok damage.
Helena
is your main choice to deal the damage. if you need to fight more than 1 enemy on a line go with her.
She costs 400$ has 100 Health and deals a lot of Damage.
Cedar
he generates you good money and also can tank a good amount of damage.
It costs 150$ has 500 health and deals no damage.