Caitlyn

CAITYLN 1# Caitlyn is the not the best adc with a yuumi, yuumi's P poke will effect caitlyn hardly.

Jhin

Yuumi is the best support for jhin because of her Q her Q helps jhin to root and get kills. YUUMI R (Last Chapter) Yuumi's R is very important to jhin when yuumi does her R jhin also does his R so they are right infront of Jhin's and Yuumi's R

Lux

Lux is an Ok apc (Ability Power Carry). It depends on what you are against a miss fortune with a lux then yeah, lux is trash but melee champions like Yasuo or Warwick then she is good lux is really in-between so a yuumi on a lux won't really be as good as you think

Twitch

Ashe

Ashe 5# Ashe is THE WORST ADC YOU COULD EVER NAME: She has her E where it just gives you vision which is more like a sup thing her Q which is for add-ons like if they get aggressive which is also a sup thing and her R is a very big sup item her R is a root which is only helpful if chasing down someone or running away it would be like a sup on a sup and running away with her R would be a waste because yuumi can just heal her.