Big list of needed reworks, nerfs and buffs in my opinion!
Champions to buff: Zac, Yorick (rework), Vladimir, Urgot (rework), Twisted Fate, Syndra, KogMaw, Gangplank (rework), and Aatrox.
Champions to Nerf: Xerath, Vi, Velkoz, Sion, Riven, Morgana, Lissandra, Leona, Leesin, Leblanc, Katarina, Kalista, Janna, Irelia, Annie, and Zed
Champions to delete: Teemo.
PS: If you want my opinion about champions being Nerfed/Buffed ask me. I will tell you my reasoning behind it.