[b]Superboy[/b] is Accepted after you fix the backstory. There's no JL yet. You can say it's just MM to make it easier. Also, watch out for tense shift in your writing. They're very jarring.
[b]Green Arrow[/b] is Accepted
[b]Starfire[/b] is Accepted
[b]Captain Marvel[/b] is Accepted though the ending of your "Since that day" was just disrespectful. 
[b]Capt. Atom[/b] is Accepted

[b]Lucian[/b] Give me some weakness for him and I don't know if you and Yog are okay with having similar characters. I don't have any problems, but I wanted to make you both aware of it.
[b]HellHound[/b] J'onn is doing the recruiting. Bats isn't really involved at all. Also, I don't want a cliche antihero in the RP. Not everyone is going to get along, but I don't want someone running around trying to do things on their own in complete ignorance of the main story. So, keep that in mind when you're making your changes.
[b]Yog[/b] You don't have to just copy the back story from a wiki. Tailor it to the RP. It doesn't have to be incredibly long, just like 2 or 3 paragraphs.