Dunkmasters
I thought we could give Darius some teammates or some competition... Some possible champions:
Obviously another dunkmaster, his style being quite comparable to Darius'.
His Q could be ball he throws, his E a rolling ball, his R being basketballs falling down etc.
The bullets of her Q, E and R could be balls
Evidently her ball becoming a basketball.
Turning her Q and R spheres into basketballs, making her dunk/shoot on her W.
Her huge bullets become basketballs and she dunks when using Rocket Jump (her W).
Q, W and R are now basketballs.
E being a basketball and he shoots some hoops when he ults.
Dribbling himself instead of just bouncing, aka body kind of becomes a ball.
His bombs become basketballs.
If anyone has more or better ideas, feel free to comment them! 
oh you didnt say drunkmaster... dont mind me im in the wrong place
Add Braum's reverse dunk 
Yasuo hitting twice then dunking for ult leaving an x with a basket ball dented into the ground, broken boards fluttering in the air for w, dribbling the ball to himself for e, and q being a quick fake of the ball that drops and rolls if he misses holding a backboard-less net and post, dark blue and black jersey
Gnar who passes the ball or spins the ball back to himself with q, dunks/slams a post with w, dunks or bounces over or double dunks with e the ball over his head, and tosses basketballs from behind him with r knocking back the enemy, green and white jersey
Kha'zix with a popped basket ball on his claw that he gnaws on every now and then, dunks with e, passes ball(s) with w, fouls people with q, changes clothes to ref during ult but when upgrated turns from purple and black jersey to just black jersey to match his red skin, his passive appears as a little basketball hoop over the head with spray paint arrows pointing to them.