I recently got ori from a capsule and decided to try her out even though midlane is my least favorite/weakest lane to play but I found her fun to play if a bit challenging from ball management and positioning and I wanted to hear any tips/help from orianna mains cause I wanna play her better despite not liking midlane.
Check out the Oriannamains subreddit for uselful tipps. https://www.reddit.com/r/OriannaMains/
I'm certainly not an Ori main, I find her way too hard, but I can give tips for runes and a small, simple tip that you can hide the Ball inside a wall. No idea what this is good for, but you can do it.
But for runes: I played on the PBE and toyed around with some theorycraft builds on the website before then, so here's an example rune page and a breakdown for it: http://na.leagueoflegends.com/en/featured/preseason-update/8200-8229?build=21222362
Arcane Comet does a lot of damage, and your Q W combo basically guarantees it'll hit because of the slow.
The Ultimate Hat is because you have a big ticket ultimate that can very well change a teamfight, but you can choose the other 2 as well. All 3 are really good, just depends on what you like. I personally like getting 60% ult CDR on anyone whose ult is extremely important.
Absolute Focus because the extra damage is nice, though if you want the CDR or Movement Speed one, they're also pretty good. Just whatever your preference is, but if you can stay safe enough, having 40 bonus AP is really good.
And finally Gathering Storm because in my opinion that's the only one in the last group worth running.
Inspiration secondary for that extra 5% CDR that puts your ult on a 60% reduced cooldown alongside Ultimate Hat and for Perfect Timing, because who doesn't like getting a 600 gold item that builds into a really good item for free?
Your ball does more dmg to the first target it hits. It also moves faster with your e protect then with your q attack. you can hide it in terrain and on stealth champs, you already knew that but it can get your ball closer to the champ you want to attack. A tip is to leave your ball where they're likely to go so you can surprise r and the use your other combos. You can flash r which is debated whether useful but it looks really cool,
During the beginning of the game try not to engage just don't miss cs because the chances are that they are going to beat you early on, don't worry though if you get your items and get to late game ori is stupid overpowered but don't miss cs
The items I get first back are lost chapter then sorcerers shoes, then spellbinders then rabadons then morelinomicon then ludens then you can choose from void staff if they have mr and zohnyas (not spelling) or liandrys torment. hope that was useful. (:
