Who says GL never had a sidekick? Meet Wally West...
...Kid Lantern!
He, ah, had a pretty brief tour of duty.
Buh-bye
Robin was a teen-ager (the Teen Wonder in the Teen Titans) and Batgirl had to be in her mid-twenties (because Barbara was a congresswoman and you had to be 25 to sit in Congress on Earth-One). There's a clear difference between teens at the age of consent having relationships with older people than kids in the same situation. Arisia was young but it's unclear just how young--given she's an alien. Querl Dox has to be very old given Coluan lifespans, but he gets romantically involved with Kara Zor-El--who herself went up and down in age, from fourteen to as old as twenty-five. Sometimes it seemed creepy to me that Jimmy Olsen was sweet on Supergirl, too--because again his age went all over the place, so he could have been as old as twenty-five or as young as sixteen, while Linda Lee seemed to be between fourteen and sixteen in the early adventures.
The way I see it, we give most of these stories a pass, because the characters involved are fantastic creations who don't age the same as people in the real world. Some characters stay in print for decades at the same age, while others rapidly age in mere months--especially any newborn babies.
But, the Robin/Batgirl situation wasn't even an issue of "the age of consent"; there was no romantic relationship between the two of them back in those pre-Nightwing/pre-CoIE days.
They were partners in terms of friends who worked well together, but they both had the Batman link to bring them together in the first place.
She had Sin, for a while anyway. In Justice League Year One by Mark Waid, she was 19 years old when she joined the Justice League. Also they had two Black Canaries at the time with Dinah Laurel following Dinah Drake's footsteps. Though she was still written in the book like an adult instead of a teenager
Kai-Ro from the future Justice League in Batman Beyond was a kid Green Lantern.GREEN LANTERN
He was actually a teenager at some point in the 90's. Ray Palmer was deaged and was leading a group of Titans.THE ATOM
Golden Eagle. Lost and forgotten since Hawkman's continuity became a mess.HAWKMAN
He built a kid side kick of him on Batman: The Brave and the Bold and it went evil.RED TORNADO
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She kissed him on one of the issues of Batman Family. Dick was on his chauvinistic rants about how girls shouldn't be crime fighters and she kissed him to throw him off and make him go away. There was some rivalry that later turned into sexual tension between them. I even recall a panel where Babs contemplates her feelings for Dick but the age difference (he was 18, she was 25) was a road block for her. Sometime later, when they were fighting the Outsider, Dick confesses her feelings to her which he likens to falling in love with your teacher, only to find out that Babs slept though his soliloquy.
That's pretty much it for them in Pre Crisis, it wasn't until the 90's with the DCAU and under the pen of Chuck Dixon that the romance between them bloomed.
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On the but about her turning out later on not to have been so young: that was a Johns retcon in response to the creepiness of the original. In fact, Johns took something from the original (the different orbital period of Arisia's homeworld) and completely inverted it: originally, while Arisia was chasing after Hall, she argued that her world orbited its star twice as often as Earth, so he should think of her being 30ish. In Johns' retcon, he initially thought she was younger than she actually was because her world's orbital period was slower than Earth's, so that her reported age was in the teens using her own calendar.
But that retcon was twenty years later, and as I said a direct effort to undo the ick factor of he original story.
Rogue wears rouge.
Angel knows all the angles.
One thing that bugs me about fandom is sometimes when these provocative stories happen the character is blamed and other times the writer is blamed. With Hal, it seems to always be him--the fictional character--that's blamed not the writer. I think if the burden is put on the writer it's a lot easier to see past those stories and just dismiss them, rather than attaching them as defining features to the character.
When Superman kills the Phantom Zoners in the Byrne run, most of fandom blames John Byrne--they don't blame the fictional character. Fandom sees it rightly that Byrne created this situation and forced Superman into it. It's therefore easier to look past that story and say it shouldn't be accepted as canon--let's get rid of it or explain it away.
Fandom seems to play favourites. Some fictional characters don't get a fair shake while others do.