Quick question, if you start as Naruto, does it mean that you begin with three captures(Minato, Kushina, Kurama), I haven't seen any rules regarding the shadow clones inside him, and since they lasted a long time, they are probably some soul pieces or something.
2. Transhuman can also do it after a certain point. I don't know the new tree as well as the old. The general-use option is to just find a waifu who can create soul-connections.