Orianna works with Leona better then everyone. When Leona start a fight use your shield (E) on it, so you will be able to combine enough crowd control to win almost any fight. Orianna + Hard CC Sup = <3

Orianna also works great with Thresh , following the same Leona scheme.

Orianna has a bonus damage on their basic attacks then also works great with champions that increase the damage of it, like Nami or Janna.

His ball gives sight, so use it in the grass when against Leona, Morgana or Blitzcrank.

Beware of very high distances like Ashe, Jinx or Sona, they can put pressure on you with their skills, but you can reverse it with your sphere.

Here is an example game,
already a long time but I think it still counts. The game lasted 23 minutes, I know that my farm was very bad.., and didnt have gank on bot by both sides .

THANKS!