Tristana
Tristana is statistically one of the worst adcs at the moment and the buffs haven't done much to help her. Not only is her win rate around 45%, but her average damage dealt is the lowest of any adc. Tower killing is also one of the most boring identities you could assign to a champion. There are already a lot of adcs that kill towers well.
You want to make her feel less clunky? Give her resets on q and e for kill/assist so she can actually kill more than one person. Give her a little damage back on her auto attacks so she doesn't feel like garbage. Do something. Please!