This isn’t helping lessen the complicated mess of this story one bit
Okay, so, before he’s the current Allen, he was another Allen who came into contact with Nea and another Bookman named Lavi. Apocryphos found him and in an attempt to kill him, Allen the Nea host survived but lost his hair pigments, memory, and age.
Then the amnesiac Allen (nameless at the time) joined a circus, and with some twisted fate, met Mana the Millenium Earl, assumed a dog’s name that’s coincidentally Allen, manifested an Innocence, and Cross Marian took him under his “care,” all while Allen himself unknowingly carrying the package that is Nea.
Or something