I have three 5* characters now...

The Herald

Is the game going to be a write off?

Should I just sell them off?

I want to keep them to start building up their covers, but I'm Champing 3*s and have no usable 4*s yet.

Have I completely screwed myself by collecting a small number of characters I like? (No OML, they're basically useless apart from raw stats)

Any advice? O.o

I'm thinking wait and see, plus don't level them!

Any advice relating to the arcane inner workings of the game are welcome.