So here i am, finally posting this, i had this idea from quite awhile ago and i was working for awhile on it, so i finally finished and here it is :D

Infinitum, the Keeper of Equilibrium
Ranged,Fighter,Mage,Support
Passive-Light and Dark : Using a skill causes it to change between light and dark form

Q-Beacon/Haze/Darklight Cost: 50/60/70/80/90/100 Cooldown:7/9/11/13/15

Beacon-Creates a beacon of light that reveals enemies in the area and heal allies near it for 50(+0.1 AP) every second, lasts 2/4/6/8/10 seconds

Haze-Creates a haze that blocks enemies’ vision and increases damage dealt to any enemies within, lasts 5 seconds

Darklight-Combines the effects of Beacon and Haze, lasts 7/9/11/13/15 seconds(Heal-50+0.2 AP)

W-Ball of Light/Shadow Chains/Unstable Forces Cost: 150 Cooldown:10

Ball of Light- Infinitum throws his ball of light to an area, pulling nearby enemies towards it and slowing them

Shadow Chains- Infinitum channels as dark chains appear from the ground around him, suppressing nearby enemies and dealing 100/150/200/250/300(+0.7 bonus AD) over 1 second

Unstable Forces- Infinitum channels as he creates a zone of Unstable Forces, which pull enemies into its center initially, then after a delay stuns them for 2 seconds and deals 100/200/300/400/500(+1 bonus AD)damage

E-Glaze/Shadow Pulse/Dark Sheen Cost:50/75/100/125/150 Cooldown:21/17/13/9/5

Glaze- Infinitum gives the target allied champion a 50/100/150/200/250(+0.4 AP) health shield that reflects damage up to a max of 50/100/150/200/250+(0.4 AP)

Shadow Pulse- Infinitum shoots a projectile made of shadows which deals 20/40/60/80/100(+1 bonus AD) to opponents that it hits, lowering by 10% per enemy hit down to a minimum of 50% and blinds for 2 seconds

Dark Sheen- Infinitum shoots a projectile of light and dark combined that shields all allies within for 50/100/150/200/250(+0.8 AP), reflecting damage up to a max of 50/100/150/200/250(+0.8 AP), and deals 20/40/60/80/100(+1.5 bonus AD)damage to all enemies that it hits, lowering by 10% per enemy hit down to a minimum of 50% and blinds for 5 seconds

R-Stabilize Cost:300/400/500 Cooldown: 200/150/100
Active:All of Infinitum’s other abilities gain combined effects from both Light and Dark forms
Passive:Infinitum deals additional damage on his basic attacks equal to 30% of his Ability Power, and reduces his cooldowns by 1% for each 20 bonus attack damage he has

Statistics:
Health:400+78 per level
Health Regen:0.9 per second+0.1 per level
Armor:14+4 per level
Magic Resist:50
Mana:200+100 per level
Mana Regen 0.5 per second+0.2 per level
Movement Speed:320
Attack Speed:0.5 +0.05 per level

Note : Using Infinitum’s ultimate does not change its form, also, using one of Infinitum’s skills does NOT change the form of his other skills, for example, Q-dark W-dark E-light, and using a skill AFTER the ultimate REMOVES the ultimate effect for THAT SKILL ONLY until the next ultimate activation. Also, all abilities that are not named as ACTIVE or PASSIVE are ACTIVE

Lore-
Upon the slopes of Mount Targon lives a tribe of people known as the Rakkor who revere combat and war as the ultimate art. Each member is bred to be a disciplined warrior to serve as lethal weapons, although some are not as disciplined as believed.

Infinitum was a tenacious and disciplined young man, or so was thought by the Rakkoran leaders. Infinitum was hungry for power, and wanted more than to lead the fight. One night while he was out hunting, his wish was granted as he met a strange but seemingly trustworthy man who introduced himself as Zed. Infinitum followed zed down to the bottom of Mount tarragon to a small circle of stone walls. Zed had promised him infinite power, in return for his loyalty. Greedy for this power, he accepted.

Zed performed a ritual on him which took over many hours of the night, and finally as the sun started to rise into the sky, it was complete. Infinitum felt the power course through his veins, and knew that he was something different, but something was wrong. Something didn't feel right to him, and as he looked down at his body, he saw dark shadows creeping up slowly, and he knew that it would consume him, which ultimately was the cost of the power that was to be bestowed upon him. In a desperate panic to save himself, he called upon the sun for help. Zed slowly walked to restrain his new masterpiece, but as he approached Infinitum, a large pillar of light shone down on Infinitum, blasting zed back. As Infinitum emerged, it seemed that the shadows had consumed him, but he was fully conscious of his actions and had a shine to his now dark appearance. He looked around and saw that it was Leona who had saved him, and he begged her for forgiveness. She looked upon him and told him that she did, but she did not know if the other Rakkor would accept him. With the thought that his own people would not be able to bear the sight of him, he departed for the only place that he believed he would fit in, the League of Legends.

“I am the shadow of the sun, the fire of the night, I am the keeper of Equilibrium...”-Infinitum

Feel free to tell me anything, besides the fact that he may be overpowered, i already know that and i trust that if he is ever made, riot will fix it :)