when its going to come to hallownest little ghost?

not until YN molt in her final form.... But you will know that is going to happen when small ghost sightings are mentioned in the lands outside the kingdom views in special chapters

it YN going to be tall or shorter then hollow (aka: phantom) and How tall will be YN?

she is going to be a tall girl...

first she its going to see hollow Aka: phantom again in the watchers arc... and she will be a little taller then him

AND.......... once she reach her final form she will be a lot taller

its quirrel going to come out??

yes he will in the monomon arc, that will be after the watchers one, spoilers this will be the gang of little ghost once he comes back to hallownest... plus zote... we need the anoying one 

will connifer and iselda be there...?

yes they will come again...

will Myla be save in this lore?

yes... i ship her with little ghost...

will be Cloth be saved in this fanfic? will you ship her?

yes she will and YES I WILL HEHEHEHEHE

will zote and bretta be a ship?

yes... zote needs love...