Nah the cameo girls are just there for some additional fun contents. Whether they get more or not depend on their creator.
Some more cameo girls are planned, but their creators are TAKING THEIR SWEET TIME (Yea, talking about you , you gremlin ┬┴┬┴┤(･_ ├┬┴┬┴)
MC's face will probably remain hidden for he is too handsome for this world
Finally Gloria's power is to make stuff, and Lily's is to control the flow of energy