[@sakurasan] From what I got from side characters... they're people that add to your character's story, not necessarily NPCS but not necessarily main either, I don't know if boss is allowing anymore side characters. Side characters are disposable. Meaning. The Weatherman might kill them xD 
BUT they're initially meant for adding to one's character story (moving things along). They can't be in their own post- (they have to be with the character when you need them), with the exception of The Weatherman.