I AM JUST A 15 YEARS OLD KID .BAD AT DRAWING BUT I'VE GOT AN IDEA FOR A NEW CHAMPION THAT YOU CAN EMPROUVE .
His name is blade X .The lost brother of vladimir and shares the same gift of controling shadows like zed .He has emproved his sword abilities by the help of many masters like yi and the elder of both shen and yasuo . But has to kill yasuo'.s elder because he thinks that his gifts are so dangerous for runeterra to handle .He then got traped in the shodow islands !Trying to survive there day after day made him ruffer and stronger !But the action begins when he met kartus  who saw the dark in his eyes and tryed to get it out and make blade x stronger . After that he becames kartus disciple in his years of training in shodow isles :when all of the evengers like yasuo  where trying to find him and take away his life . But now he rises to find another challenger . And there is no better place that the glorious league of legends to find his new rivals .and he maybe discovers his lost brother vlad after a good fight against him .
-His passive is called the dark pact .every 5 aa he summons a shodow that have the same attack speed and reduced attack dammage but mouves a bit faster when spawned (attackes 12 times then despawns and has 12 hp who can only be proxed by aa max 2 shodows)
-His Q is called diabolique slashes . he does a combo of 3 different attacks the first is an attack using his two swords from the side to the other. the second is a triple transpersing attackes and the last is an attack with both swords forming an X. The 3 combo parts counts as an aa that can spawn a shadow . The shodow may perform the part that made him spawn with slowing with the first reducing enemy defences with the second and silencing for a short period with the last one
-W witch called death's dark side is a double sword slash from down to up and can knock up for a short period . if a shodow was near he then jumps to that target and slashes him:keeping him up for an extra time while adding a slight bleed debuff (the shodow will diseapear after)
-the E is a more of a defencive abillitie called nocturne fire dash with a jump/acrobatic mouve like kindred's  Q but long ranged that does dammage and gives him a dark fire halo with a shield when a shodow is near enought .If not he gains health every time an abilitie was casted on him
-The ult is called X unslaught/barrage when B X gives his two sword to shodows that hit forming an x then he jumps while getting his swords back and doing aoe dammage in the middle of the x ! every enemy hitten is blinded like the effect on nocturnes  for 1.5 seconds
I hope that this idea is good i am just relying on your imagination to make this champion a true thing *[slayer-pantheon-thumbs]*