Suggested Buffs and Reworks
Hello Riot and summoners, I may not be any important player since I am, of course, not level 30 yet and not in any elo, but all I ask is to hear me out on some of these suggestions for buffs or reworks on these champions. Mainly I am doing this for the fact that I believe all champions should be at least around the win rate of 50% and be considered viable/balanced.
First, we have a champion that is receiving a lot of popularity now: Azir
He is somewhat a strong pick but his win rate is terrible and his base damage, along with his attack speed, is very low.
I think he should have a moderate buff to his base damage, ability power, and attack speed so that his general win rate improves, but he doesn't become over-powered.
Second, we have Kassadin
Though Kassadin is quite bursty and has a lot of mobility, he has a bad win rate and should be reworked.
This rework should change how his E and R work along with buffing his Q and W.
Third, we have Ryze
Even though you have buffed him in patch 5.10 he is still quite weak and has a low win rate.
He should be buffed in order to higher his damage just a bit and lower his cooldowns and mana costs just a bit, as well.
Fourth, we have Syndra
Just like Kassadin, she is very bursty and has a low win rate.
She does, however, counters quite a lot of champions because of her high burst (or it's just me) and she should have a rework to manage how her balls work and to manage her damage, cooldowns, and mana costs.
Fifth, we have Urgot
Urgot is considered as part of the meta now, but his win rate is low. He is a good champion, but maybe a small buff should be implemented or a rework should occur.
Last, but not least we have Bard
He has been receiving a lot of buffs recently, but his win rate is still low. I suggest a rework or maybe just leave the Wandering Caretaker alone.
Other champions should also have buffs or reworks, so here is a small list of them:
Elise
Shyvana
Lee Sin
(still powerful, so you should decide whether or not to buff or rework him)
Olaf
(depends since he is still quite powerful, too)
This other list contains champions that are still strong, but have kind of low win rates:
Lucian
Orianna
Dr. Mundo
Alistar
Twitch
Kha'Zix
Ezreal
Jax
Jayce 
needs it too