What the Rift Lab holds on this champion: the kit as Riot publishes it, the build the lab reviewed, and the matchups it has documented. Anything the dataset does not record is left out rather than filled in.
Riot's own text for each slot, in the order the champion learns them.
Periodically, Yuumi’s Basic Attacks and Abilities will Shield Yuumi. If Yuumi is Attached to an ally or attaches within a few seconds they are Shielded for the same amount. While Attached to an ally, Yuumi grants them Friendship stacks when they kill enemy champions or minions. The ally with the highest Friendship stack becomes Yuumi’s Best Friend, which empowers her abilities towards them.
Yuumi fires a missile, dealing Magic Damage to the first target hit. It deals bonus damage and Slows if it takes at least 1 second to get to its target. While Attached, the missile can be controlled with your cursor. Best Friend Bonus: Applies Slow on hit, and when hitting an enemy champion, Yuumi’s Attached ally gains bonus Magic Damage toward them.
Passive: While Yuumi is Attached to her Best Friend, She gains bonus Healing and Shielding, and her Best Friend also receives additional Healing effects. Active: Yuumi dashes to a target ally, becoming untargetable from everything except turrets.
Yuumi grants herself a Shield and gains Attack Speed. She also gains Move Speed while the Shield is active. If Yuumi is Attached, Zoomies affect her ally.
Yuumi launches five waves in the target direction. While Attached Yuumi can steer the direction of the waves. Detaching stops this bonus effect. Allied champions hit by the waves are Healed, with increased Healing for the Best Friend. Excess Healing converts into a Shield. Enemies struck by the waves take Magic Damage and are Slowed. The Slow stacks and refreshes on each hit.
The reviewed purchase order and rune page for this champion. Every entry that has a page of its own is linked to it; an item the catalogue holds no page for is printed as a name rather than pointed at a page that does not exist.
One slot, changed when the enemy team changes the problem. These are answers, not automatic purchases.
Ability text and the in-game title follow Riot's official Wild Rift champion pages. The tier letter is the external snapshot shown on the tier list, and the build is the Nexus reviewed snapshot — neither is a win rate.