Yuumi the magical cat. I want the first release one back with specifiction.
Please read carefully I know my english is bad :)
From her base stats when she came on the rift I want those changes. 
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Nerf her Q spell damages, doing over 90 damages level 1 againts an adc with around 400 health level 1 is not ok or increase her coldown. Her Q was impactfull when you chase ennemy team late game.
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Her W is fine since she give adaptive damages to her allies when attached, the CC fix was good move being able to bypass cait trap or lux Q was not ok and you did remove it, also the new Punishment you gave her after getting cc, your w is put on a coldown decrease the coldown at the miminum or depending on the cc casted on you. Exemple: thresh flay 1s punishment, thresh hook 0.15s punishment. what I want to say is why do we need to be punish when we already been punished from a cc.
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Her E spell bring back her old E with 2 charges but nerf it, the 10% was too op with the other 10% from runes when you allies was under 40% HP. I seen myself healing him from 1 to 600 obviously needed to be nerfed.
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Her ultimate, I see this spell has a mass CC ennemy team I dont Understand why her ult need to be given damage I would suggest to remove her ultimate damages.
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I would nerf mana gain or remove it on her passif but increase her shield gain. if a yummi doesnt go out for passif that's the way she need to be punish and lost the fight but her healing was too op on her previous version so she only needed to heal to win 2v2 and you could win 2v4 if you used the shield passif.
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Also remove her from purchasing boots Like cassopeia.
I been spammed her when she come out and she was broken, her low winrate was due to bad yuumi player and overrall player who think yuumi was bad and getting mad at us for playing her. I suggest the bring back the first yuumi who came out with specification. I on fact that she was not getting cc properly and its been fix also I agree on being attached on a allies on is channeling tp. and I dont really care about W change I think they are ok. dont forget to tell me how wrong I am in comment sections I love yuumi and I got decrease interrest in her when you started buffing her after she was op. her low win rates was duo do the player who was mad to have her on there team for previous bad yummi player, I seen this same effect on ornn passif when player would purchase upgraded item early into game and waste 1000 gold, you did a great job on his new passif system.
I would like to enjoys my yuumi when she first came out. I know she was op because I was hardstuck gold4 and peek gold 1 with plat mmr and after that I stopped player her and got bring back to my elo :) gold 4 . so I personnaly know what In her hand was broken, her healing and early Q damages.
I had 60% win over 200 games played with her, My MMR was bad and gain 14-15-16 lp after game when I reached gold 1 and stopped playing her since you started changed her and buffing her from outfix I can say I abuse her when she was op but now she is kinda bad and not as fun.