The best champs not in lane to counter 오리아나 include 카서스, 아펠리오스, and 자야. These picks are all good at countering 오리아나 with decent win rates over 59%. Even if these 오리아나 counter picks are not played opposite your position, it's not smart to play her into these matchups. They will likely destroy 오리아나.
Yet, if the other team choses either 직스 or 쉬바나, you should seriously consider taking her, as she easily crushes these champions with win rates over 53% against both ofthem.