an author doubt just out of curiosity if Erza Scarlet (Belserion) is technically the daughter of a dragon she should not have part of a dragon core giving the possibility of becoming a Dragonewt
hopefully you can unlock for the rest of the olds the Nen and see what ridiculous things they can project, then unlock Haki, then learn Touki, and finally receive blessings from the spirits of Ramiris
If I understand Kurogane Ikki correctly, thanks to Urahara Kisuke's experiments, he could have manifested a Zanpakuto and have a Shikai & Bankai version