[quote=@VitaVitaAR]
Yoshika is frankly a more substantial character from what I know. I'm not saying she's not allowed, but she should get a bio of her own at least.
[/quote]

One-of-Many is substantial enough to merit a history and bio, too. I mean, he's got an astonishingly rich history and personality depending on who exactly the protagonist has eaten (Okku at the least, with others potentially added), and his powers are often totally different depending on which important character makes up One-of-Many. Is this the warlock One-of-Many with just a little bit of the Sleeper in it? What happened with Akachi's soul, and how did it react? How does it feel about being in a multiverse and being forced to dance on some mysterious leader's leash? Are there any characters he's already eaten and stole their powers from?

Ultimately, it's up to you.