Changes I would make to Yuumi (as a Yuumi player)
I like playing Yuumi I think she is fun and I can do things for my team that no other support in the game can but I can understand the difficulties people can face fighting her, Yuumi is one of those champs that if you want to you can play them in a really lame and boring way. I do agree her gameplay needs some changes but I don't want to see what makes her fun and unique to be lost or her as a champion to be gutted.
Reworking Bop 'N' Block. Bop 'N' Block no longer creates a shield. Bop 'N' Block's new function would give increased attack range for one auto attack against enemy champions every 25 seconds "lowering to a max of 10"
Bop 'N' Block would work with Yuumi's Q and E
If Yuumi castes Prowling Projectile for the next 5 seconds Bop 'N' Block is empowered making Yuumi's next attack with it deal a small amount of magic damage and return mana. if the target was also hit with Prowling Projectile the mana returned is increased.
If Yuumi castes Zoomies for the next 5 seconds Bop 'N' Block is empowered making Yuumi's next attack increase Yuumi's current shield by 50%.
Reworking Zoomies. Zoomies no longer heals Yuumi when she is unattached from an ally champion. Instead, Zoomies creates a small shield that lasts until it is broken. Zoomies shield stacks up to 5 times, however, Bop 'N' Block is unaffected by this.
Zoomies heals ally champions as normal when Yuumi is attached to them.
Reworking You and Me.
here we go the biggest change that I hope justifies everything else.
You and Me is unavailable for the first 10 minutes of the game, in its place is the spell (Book It!)
how (Book It!) would work is when Yuumi uses it on an ally she will dash to them as if she is going to attach but instead of attaching she will place her current shield on them removing it from herself. (Book It!) has a cooldown of 10 seconds. this opens herself up to be ganked
when 10 minutes pass Book It! reverts back to You and Me.
the complete purpose of the little reworks and more importantly Book it! is to give Yuumi's opponents a large window of time to fight her more directly while also giving her tools to be more independent from her carries, primarily in the laning phase making an afk heal bot playstyle impossible.