Janna's core tools Howling Gale (Q) and Monsoon (R) are all anti-engage, but Yuumi has no forced engage, so those weapons sit idle. Meanwhile Yuumi pokes from range with Prowling Projectile (Q) and sustains with Zoomies (E) heals to take over the scaling game.

Yuumi goes untargetable once she attaches with You and Me! (W), but her lane poke is weak, so Sona freely chips the ADC with Hymn of Valor (Q) and dominates the poke war.

When Yuumi is detached she has almost no lane pressure, so Milio dominates the 2v2 attrition with Ultra Mega Fire Kick (Q) and Fired Up! (P) burn poke. Yuumi has no way to punish him.

Leona chains CC onto the ADC with Zenith Blade (E) and Solar Flare (R) for a guaranteed all-in. Yuumi has neither CC nor peel to break the combo.

Nautilus locks the ADC in a CC chain with Dredge Line (Q) pull, Staggering Blow (P) root, and Depth Charge (R) stun. Yuumi has no way to cleanse or undo the chain.

Pyke hooks with Bone Skewer (Q) and instantly executes low-health ADCs with Death From Below (R), building tempo through roams. Yuumi's squishy partner keeps getting picked off and she has no damage to retaliate.