In an effort to stop posting my Beefcake/Cheesecake Appreciation Week contributions so late in the day...
No, this is not MY big gay brother; it's the current Legion Colossal Boy's. I call him "No-name" because I don't think we know his name yet. Just for those who don't read the current Legion, Colossal Boy comes from a race of giants, created by Bizzaro Brainiac no less (who says zaniness ended in the Silver Age?).
What's interesting about the context is that Shrinking Violet knocks the poor guy out in the next panel!! We're told on the following page, the microscopic Imskian civilization worships Brainiac 5 for some reason.
Based on her reaction to No-Name, I'll bet Violet's backstory has something to do with Brainy rescuing her people from enslavement by... wait for it... a GIANT (which could be any normal-sized person considering the perspective).