I'm really, really sorry if there is already a thread about this, and if there is, one of the mods please delete this thread as soon as possible. I looked for the "search button" for 15 minutes but i haven't found it yet. So, please understand that this thread may be a repost.
That set aside, who really was Mana Walker? We have so little information on him. There is some speculation that Mana Walker was the Noah who betrayed the other Noahs, but that sounds a little far-fetched to me.
Anyone else have any more info except for the basic facts that he was the foster father of Allen and that he was in a circus?