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With his broad shoulders, toned arms and black T-Shirt stretching over his chest, he definitely has the build of a superhero, he knows that.
But then he is standing in the changing rooms at Mount Justice, looking around.
There is Beast Boy, who has barely hit puberty, but then again, do boys who shapeshift into animals hit puberty?
La'gaan, with his swimmer build, but you can't really compare your human looking body to a fish guy, can you?
Impulse, who, how old is he anyway? He can't be older than Nightwing when they rescued him from Cadmus, so 12-14 ... maybe? Either way the boy looks underfed no matter how much he eats, rips protruding, stomach flat, almost sickly looking, still the amount of energy he has tells a different story, so he's probably fine ... right?
Then there's Blue Beetle, he is about as old as Connor's body. His build is lean, promising a growth spurt at some point in the future. His muscles are still growing, due to Scarab using the nutrients food gives him to sustain itself.
And then there are the two boys, men, who would probably even make Superman self-conscious.
Aqualand, with his swimmer build, broad shoulders, toned muscle, eel tattoos winding down his arms. There are his strong thighs, used to quickly moving him through the dense depths of the ocean.
And Nightwing, who due to growing up in the circus and then training under Batman, only grew into the lithe acrobat build he was blessed with, body under his suit nothing but bones and muscles, scars painted over them like an artwork.
And then there is him, Superboy, broad shoulders and toned arms, but that's it. He doesn't have thighs that can push him though the water at Atlantian speed like Kaldur'ahm. He didn't have to work out a single day of his life like Nightwing, giving him the build of someone who can jump off a 5 story building and still land gracefully on the pavement underneath.
No all he has is a layer of fat, covering the abs that Superman is showing off so proudly, in his skin tight suit.
In the end he was still half human DNA, the Kryptonian half enabling him to have super strength, but still having to work in order to look like all the superheroes who walk around the Watchtower.