[My Champion Version] Omen, The Dream Eater (stealth tank/assassin)
Where did he came from? He is from dream realm. He is born out of dreams of traitors, thieves and liars. He managed to to escape the world of dreams and enter Runeterra through the final dream of dying magician.
Who he is? He is dream being. However, because he left dream realm he can't go back to where he came from. His origin is similar to Nocturne's, so you could say that they are relatives.
What do he want? Runetarra is nothing like the dream realm. This new world offers him so much, yet he still misses some of his kind he left in dream realm, so he wishes to open the gate between two world for all dream beings to invade Runeterra.
Is he evil? Not exactly. He is dream being, so he is without morality or common sense. All he does is normal and perfectly fine to him. He doesn't know the difference between good and evil, so he is neither.
Why did he became a champion? He wants to learn how Nocturne entered Runeterra and do the same for other dream beings.
Friends:
Enemies:

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COMBAT
Attack range: 155
Passive: Dream Eater: basic attacks on enemies who are suffering from any disable effect will cause 10/15/20/25/30/35 (+2 per level) bonus magic damage and heal you for 50% of damage done by this effect. In addition, all your disable effect on jungle monsters lasts 50/60/70/80/90/100% longer.
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Bad Night [q] Passive: your basic attacks will heal you for 5/10/15/20/25 (+15% of your armor) (+1% of your max health) health.
Active: slowly meld into shadows over 1 sec (extended to 4 sec while suffering damage) and become invisible for 3 sec. While invisible you move 10/14/18/22/26% faster and exiting stealth cause nearby enemies to run in fear for 1 sec. Cooldown: 14 sec Mana cost: 55 Range of fear: 285
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Mind Impaling Spikes [w] Launch volley of spikes in a cone (5 spikes). Each spike deals 50/80/110/140/170 (+70% of attack damage) physical damage. If enemy is damaged by more than one spike, then total damage taken by this ability can't exceed 120/180/240/300/360 (+150% of attack damage) physical damage. If used while invisible, this ability will not reveal you, but deal 50% less damage. In addition, if you hit any enemy champion, then your magic resist will be increased by 20% for 2 sec. Cooldown: 8 sec Mana cost: 90 Range: 650 End Width: 440 Casting time: 0,2 sec
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Nasty Pounce [e] Pounce into targeted direction dealing physical damage equal to 3/4/5/6/7% (+1% per 20 attack damage) of max health of enemy hit (can pounce over the walls). If you hit an enemy champion, then stop at his/her location and stun him/her for 1,5 sec. Cooldown: 12/11/10/9/8 sec Mana cost: 55/60/65/70/75 Range: 450 Casting time: 0,45 sec
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Dream Ravager [r] Passive: while invisible or inside of bush you gain 30/35/40% bonus magic resist. In addition, becoming invisible will reveal all other nearby invisible targets (but only to you). Range: 320
Active: ravage a targeted enemy for 90/140/190 (+100% of attack damage) physical damage and reduce his/her vision range by 50% for 1,5 sec. Deal 75% more damage to jungle monsters and stun hit jungle monster for 1,5/ 2/ 2,5 sec. If used while invisible, this ability will not reveal you, but deals no damage and reduces your target's vision range by 75% for 2,5 sec. Number of uses: 3 Global cooldown: 1,5 sec (how fast can you use build up uses) Recharge time of one use: 28/26/24 sec Mana cost: 75 Range: 300
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, the damage of a fed
and more tankyness then
...