To the Second Growth, what characters can do it in this versión and how i use it? I have Nady
All Hyper characters + Narrator-chan who is the patreon exclusive character. In general all Hypers and Primes will be able to do it. Currently Tio doesn't as she doesn't have her potentials, which will be gained in the story as it progresses and at some point you will see her grow too.
There are diffferent conditions to each growth though, so you should read their passives to find that out.