So what if the Legion of Super-Heroes decided to recruit a completely different teenager with their shiny new time machine? Once that wasn't a legendary hero?

Here's one take on it, very AU, since the origin is completely different than that of the original character, although I tried to make it 'fit' interestingly into the DC cosmology.

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“Is something wrong Brainiac 5?”

“Yes, using my time machine to go back and recruit, ‘Superman, but when he was a teenager,’ is all well and good, but if we are going to do something as potential life-changing as traveling into the past to recruit a legendary figure in the past, wouldn’t it make sense to recruit someone whose life as a hero would make a difference?”

“Surely you’re not saying that Superman didn’t make a difference!”

“Surely not. Superman was a legendary hero, already, and will be whether we get his autograph or not. Recruiting him to join our team would change nothing, and, in my opinion, reflects nothing more than frustrated teenage super-hero worship from people who should know better. We already are heroes, each of us representing a different world and an entire species with histories every bit as rich as Earth’s. We don’t need Superman, or Superteen, or Superlad or whatever, to give us legitimacy, and, again, in my opinion, going back to pull this heroic inspiration out of history is only selling ourselves, our accomplishments, and the various worlds and cultures we hail from short.”

“I’m probably going to be trampled by wild animals for saying this, but I think I agree with Brainy. Superman may be a great champion of Earth, but my family have been the Champions of Talok VIII for generations, and I don’t understand the hero worship of this man.”

“It sounds like you had an alternate idea of whom to recruit.”

“Indeed, Saturn Girl. I’ve even got a historical file prepared. Instead of one of the admittedly dozens of great champions from Earth history, which I feel would be somewhat redundant, as we already have several Earth natives whom we’ve obviously deemed every bit as worthy of membership, this potential hero comes from the world of New Genesis, and is also quite powerful. Most importantly, recruiting him in his formative years to serve as a hero, a champion of his people, could be far more productive than inviting someone whom history already regards as a hero…”

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Kid Omega (Aleph, of New Genesis)
PL 10 (150 pp)

Abilities: Str 18/30, Dex 10, Con 30, Int 14, Wis 20, Cha 16 [48 pp]

Attack: Melee +6, Ranged +6, +10 with Omega Effect [12 pp]
Defense: +3 (+2 flat-footed) [6 pp]
Initiative +0
Damage: +10 hand-to-hand, +10 with Omega Effect Blast or Teleport Attack
Saves: Toughness +17 (11 Impervious), Fort +10, Ref +0, Will +5 [0 pp]

Skills: Bluff 0 (+3), Climb 0 (+4), Computers 1 (+3), Concentration 4 (+9), Diplomacy 1 (+4), Disguise 0 (+3), Escape Artist 0 (+0), Gather Information 0 (+3), Handle Animal 2 (+5), Intimidate 2 (+3), Knowledge (earth sciences) 6 (+8), Language (Genasian), Notice 4 (+9), Perform (oratory) 2 (+5), Search 2 (+4), Sense Motive 4 (+9), Stealth 0 (+0), Survival 4 (+9), Swim 0 (+4, autofails) [8 pp, 32 ranks in skills]

Feats: Diehard
[1 pp]

Powers:
Density 6 (Extra: Continuous, Flaw: Permanent, +12 Str, +3 Impervious Protection, +2 Immovable, +2 Super-Strength, x5 weight, +Str does not count for Swim/Climb checks, autofails Swim checks) [18]

Immunity 10 (aging, life support) [10]

Protection 4 (Extra: Impervious) [8]

Impervious Toughness 4 [4]

The Omega Effect (Effect: Teleportion 10 (Extra: Portal, Flaw: Action 1 (move action), Power Feats: Change Direction,
Alternate Power – Teleportation 10 (Extra: Attack (Ref save to avoid), Power Feats: Homing, Change Direction, Change Velocity, Accurate 2)
Alternate Power – Blast 10 (fiery force teleported in from the molten core of his home-world), Power Feats: Homing, Accurate 2, Indirect 3)) [32]

Super-Senses 3 (tremorsense) [3]
[76 pp]

Abilities 48 + Atk/Def 18 + Saves 0 + Skills 8 + Feats 1 + Powers 75 = 150 pp

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Alternate Cosmology 101;

The world of New Genesis is located in an extra-spatial pocket dimension, and only accessible to the outside universe through specialized wormholes known as ‘Boom tubes.’ (For the thunderous explosion of air and sound that tends to accompany their formation.) A rare natural occurrence, connecting this isolated world with the outside universe, they have been ‘tamed’ by the science of the ‘New Gods’ of New Genesis, who can use a machine they term the Mother Box to not only predict the natural occurrence of these phenomena, but to actually force their manifestation, and precisely control the exit destination, through a form of causal quantum manipulation called the Observer Effect.

New Genesis was a world of potential, unstable and composed of proto-matter, raw and unformed, when the New Gods first arrived. Stepping onto the surface of the world, they found it responding to their hopes for a new home to call their own, and new life begin to spring up underfoot, spreading like wildfire to cover the globe. Responding to their preconceptions, just as the Boom Tubes responded to direct observation, the world became a green and living thing almost overnight, it’s unstable and undifferentiated matter solidifying and stabilizing into forests and oceans and mountain peaks, teeming with life and bathed in newly formed weather patterns sweeping across suddenly-blue skies. The first child born on New Genesis was named Aleph, and both his body and the processes of the planet became inextricably linked when he drew his first breath and the air of New Genesis entered his tiny lungs. His first cry boomed like thunder, and the skies thundered back, and as his first tears fell from his burning eyes, the heavens opened up in sudden shower.

Izaya celebrated the birth of his son, and as Aleph grew, his connection to New Genesis only strengthened. His skin was a smooth pale grey, resembling marble in texture and as durable as the foundations of the world. His child’s laughter rumbled like thunder, and his eyes flashed the fires of the molten core of New Genesis itself.

He seemed wise beyond his years, capable of great exuberance, and yet also full of calm in the face of adversity. At times, Izaya would peer into the burning eyes of his firstborn son and wonder how such a boisterous happy child could at times seem so distant, so ageless and unfathomable. The connection between Aleph and New Genesis ran both ways, and not only did the skies weep along with the boy, but the boy would grow excited in anticipation of coming storms.

Izaya quickly forsaw the impending disaster when his younger sons came to him with the news that Aleph had left with these ‘Legionnaires,’ to join a team of heroes in the distant future. Severed from New Genesis, which had enjoyed an eternal springtime, slowly fading into summer throughout all the long years of Aleph’s youth, autumn came overnight, and winter was sure to follow, as the world itself wept at the loss of the young man who had literally become its’ living manifestation.

For his part, as ‘Kid Omega,’ Aleph enjoyed his new status as hero and Legionnaire, his body forming a connection to Earth, and mistaking his strange mood swings and physical lassitude for some sort of ‘time-sickness.’ Earth, for all its’ wonders, was a world fully formed and was not his home, and his body finally rejected this world, leading to both illness on his part, and a rash of unusual weather and geological events around the globe. The Legionnaires attempted to pull him from duty, on account of his weakness and out-of-control powers, not yet fully realizing the danger, but he rebelled and snuck off-world to join them on a mission to a newly discovered spatial anomaly, that was threatening star-travel. Disappearances in this ‘sargasso of space’ turned out to be linked to the appearance of a new world, one that Phantom Girl described as ‘only part real.’ Arriving in the affected region, the Legionnaires were surprised to see reddish portals appearing, similar to the ‘Boom Tubes’ used by their newest recruit, and reaching out instinctively, Kid Omega pulled himself and his fellow Legionnaires into this ‘not entirely real’ world. Surprised at the realization that Kid Omega had stowed away with them, the Legionnaires barely escaped the crash-landing of their cruiser on the hazy and indistinct world, and in their attempt to confront Kid Omega ended up being brushed aside by a display of power they had never seen from him before. His unstable life-force, ravaged by the loss of his connection to New Genesis, seized onto this unstable world’s own energies, and the world itself heaved and shuddered, remaking itself to match the chaos in his soul. The unstable world and the unstable young man fed each others spiral into madness, and great cataclysms shook the world as the Legionnaires took safety and tried to protect their fallen cruiser and get themselves to safety, while others attempted to retrieve their stricken team-mate, only now becoming aware that he was the cause of the recent spate of natural disasters back on Earth. When they finally reached him, a battle ensued, as he lashed out, unwilling to be separated from another world, one that was already entwining itself into his soul and filling the places left empty by his removal from New Genesis.

It was Saturn Girl who uttered the fateful words, ‘You can’t stay here! This isn’t your home, it’s apocalypse!’

Tapping into the power of the Boom Tubes forming chaotically around the screaming and warped space around this shuddering world, Kid Omega hurled the Legionnaires, cruiser and all, away from the planet that he later named Apokalips, and closed the Boom Tubes completely, sealing himself, and his new world, away from the rest of the universe.

Some say that a dark and twisted man shaped this world into a grim and hellish place, but it is equally true that this broken burning world twisted the soul of a young man into the creature now known only as Darkseid. The man once known as Aleph, firstborn of New Genesis, reached beyond time itself, to raid and attempt to destroy his old home-world on many occasions, with none but he knowing the dire truth, that Apokalips and New Genesis are one and the same world, simply occupying opposing points in the endless stream of possibilities, and both worlds represent the primal possibilities of *all* worlds, which lie in a continuum between these extremes of paradise and perdition. ‘Kid Omega’ had not replaced his connection to New Genesis, he had indeed, *come home,* to a world sundered by his leavetaking so long before.

If Darkseid were ever to succeed in destroying New Genesis, then all the worlds in the universe would be twisted and darkened as well, to become more like Apokalips, and all would be as strongly tied to the cold heart of Darkseid, increasing his power by magnitudes untold and ensuring his dominion over the universe…