Nothing is right about the show you have Dick in Tim's role and costume Wally in Bart's role and Costume a no name Aqualad as leader and the only original member is Connor thumbs down 

"Nothing is right about the show you have Dick in Tim's role and costume Wally in Bart's role and Costume a no name Aqualad as leader and the only original member is Connor thumbs down  "

Probably Donna

" @WW-Fan: yeah...its about time she appeared in a cartoon."

" @Primmaster64 said:

" @WW-Fan: yeah...its about time she appeared in a cartoon."

yes! "

it may just be me, but could Artemis be wondergirl as Cassandra did maintain an attempt at a secret identity in the beginning as well.

Is it wrong to want a blond-haired Donna Troy?

"Is it wrong to want a blond-haired Donna Troy? "

LOL It is most likely to be Donna.

Neither was Dick nor Wally. lol

I believe Wonder Girl will become a member of the team at the end of the season, when a major character is supposed to die. She was going to be an original member but due to legal issues with the character she was banned from any appearances on the show, the ban has been lifted though.

Only Wonderwoman appears there's never Wondergirl she only appeared as a cameo in the Teen Titans I wonder if they will be doing the same in Young Justice

They don't need Wonder Girl, the team already has two tanks in Aqualad and Superboy.  The team needs an energy blaster. 

I read that she will appear later in the show.

Which Wonder Girl would it be? Cassie or Donna Troy? I hardly know anything about either so I guess I'm not exactly partial to either. They'd probably throw in Donna, having her have no interest in Superboy since Ms. Martian and Artemis are doing more than enough of it already. =P

Yeah, I'm thinking Donna too. Since they are using the first incarnations of all the other characters. If there is going to be a second season I do hope she will become a regular.
 
I guess they did that to make it easier for the casual fans. Since it might be difficult to explain there being a 3rd Robin or 2nd Kid Flash and the writers didn't feel like spending time to explain that, but I don't know. I am a West and Grayson fan so I didn't mind them being in the series even if it was a little odd at first.

Garth appeared in the last episode

I want wonder girl on the show, bad!!

She'll no doubt show up in later episodes. Arrowette and Secret will be showing up, so Donna/Cassie will follow shortly.

I'd prefer Wondergirl over Artemis any day!

Just because there are the first incarnations of most of the characters on the show doesn't mean it's always like that. Garth isn't, and Roy isn't. So it could possibly be Cassie and they could introduce Donna as her "older sister" or whatever in later episodes.

I hope it's Donna though. I think they need a girl who is a "happy medium" between Miss Martian and Artemis, and Donna always was the sort of middle ground between Starfire and Raven in the New Teen Titans. I just think she would fit best on the team.