Yeah, you can count Superboy and Supergirl, but they're not so much sidekicks, at least the way Robin is.
And I have a feeling that probably wouldn't work out, as Iceshadow pointed out.
"Alright, first day as my sidekick, huh? I'm sure this'll be the beginning of a great partnership. Now let's get down to business. I hear a bank robbery going on across the city, let's fly there and take care of it."
"Umm...I can't fly."
"Oh. Well, I suppose you can leap there, I just hope you can keep up."
"No, I don't think you understand, I'm an orphaned young acrobat, I don't have any superpowers."
"Oh, wow, really? You can't even turn into water or something gay like that?"
"No, I think that was one of the Wonder Twins. Couldn't you, like, teach me some stuff?"
"Uhhh, no, not really. Jesus, this is embarrassing."
"What do you want me to do?"
"Um, I guess you can go back to The Fortress of Solitude and just hang out for the rest of the day. There's some left-over pizza in the fridge and you can watch tv but don't order anything On Demand unless it's free."