>>532458137
each gives you the ability to summon one of the (extremely unethical) experiments to your side in a battle, so long as you have the space for them.
H59 is Fermi's, for example. They do similar things to how their normal selves act as well.
I dislike how much I think she looks cool given the process used to make her but at least it was a clone and not the actual Fermi; still messed up though.