Waaay back in 2006, when the Legion of Super Heroes cartoon first aired, an s_d 1.0 member thought that Bouncing Boy would be the Legionnaire who'd be subtext-y for Supes.
Then the episode "Legacy" happened. Hindsight, as they say, is 20/20.
From Legion of Super Heroes in the 31st Century #11:
(There's a sort of Martian Liberation Front terrorizing the place in J'onn J'onnz's name. "What did the United Planets ever do for us?!")
Yes. Training purposes. Is that what they're calling it now?
Bonus, best interview ever:
WF: Fans sometime turn to the comic book spin-offs to see some of their favorite characters pair up in a romantic context. Legion of Super Heroes had a unique relationship that many fans were hoping to see expanded upon - Brainiac 5 and Superman. Any thoughts on why fans took to that pairing, could have it been explored in any further context, or could it have been done realistically at all? Do you have any thoughts on that relationship, or one you were looking to explore?
JT: I definitely wanted to explore Brainy's "man crush" on Superman more. I also wanted to add Supergirl into the mix at one point and do some fun stuff with that "love triangle." I don't know if Brainy's love for Superman was of the romantic type, but then again, he has a 12th level intellect and his concept of platonic love versus romantic love is probably more complex than we could understand. I don't think we could accurately define it with our 21st century labels, nor would I necessarily want to in the context of this comic book.
(Why did the comic series have to become crappy and get cancelled? Whyyy?)
Seriously though, Legacy also gave us Alexis and that alone makes it worth watching
on YouTube right now, go go go.