I was thinking of
Gaster...
And this handsome was created.

Inspired by Undertale's Gaster...

Skull! (Or Mr. Skull)

If any of you can remember Mr. Smiley from the previous book, I just thought of a great idea of them being brothers!!!

Smiley's the optimistic one, while Skull's the opposite. But he tries hard to be like his brother. Since Smiley is older. Skull can be really joyful and childish, but he knows when to be serious. He's reallyyy good at fighting though doesn't know how he knew how to fight. He's really kind and generous.

How he got the crack.. who knows? ;3

What age would he be? As well as Smiley? (Still dunno)

I've also made it official that Skull and Mr. Smiley will be official PCs (but not with the Main 5, or whatever you call those 5 OC girls).

If you guys can comment few other personalities or background for Skull, as well as Smiley, it would be amazing. :)