If you object or tattle or thwart her in any way, Chelsea probably will make you miserable until the day you two graduate.
As for Josh...well that's awesome. I tend to like quiet characters, as when they post you get a lot of what they're thinking and feeling internally which I enjoy reading personally. Not that there's anything wrong with the other type, its just a personal preference.
Also, I have about the quietest, shyest character you can imagine, Adam. I keep worrying someone's going to come along whose shyer and then people remind me its not humanly possible lol.