Keen Smell. The Yuumi has advantage on Wisdom (Perception) checks that rely on smell.

Attach. As an action, the Yuumi can designate a creature. The Yuumi hovers in the same square as the designated creature. The designated creature adds 1d4 to any melee attack it makes.

You and Me. The Yuumi cannot be directly targeted by any attack while it has a creature designated.

Claws. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.

Prowling Projectile. Ranged Spell Attack: Yuumi can cast magic missile with one missile a number of times equal to the players level, or moster's Challenge Rating, divided by three, rounded down.

Zoomies. The Yuumi can heal the designated creature for 2d6 health twice per short rest.