LoL Yuumi players will find her to be a difficult champion to build out properly. You'll see that her build changes when she is playing against either generic or highly focused team comps, indicating you should not take the same Yuumi build every single game of League of Legends
The most important items to use in your champion's build include: Chant de guerre de Shurelya, Bénédiction de Mikael, and Encensoir ardent. Those who added these items in their builds had a significantly better winrate than those who went for other Yuumi builds. Similarly, if you are facing a varied enemy team comp, you should strongly consider getting Yuumi the Sorcellerie, and Précision runes. In recent games, she won the largest number of her rounds when built with these runes.
We came up with our Yuumi build guidance by examining 108 059 recently ranked League rounds with her selected. We only recommend the top winrate Yuumi builds that have been built by ranked gamers enough times for us to propose them. With so many games in our data, we are quite confident in our recommended builds.