Champs who need changes (in my opinion)
This is based on my experience and opinion. It is perfectly natural to have a different opinion.
Broken OP champs who need nerfs:

Champs who need slight changes or slight nerfs:

Champs who deserve reworks, updates or slight buffs:

If you have something to add, then feel free to do so. If you disagree, then feel free to disagree.
needs hard buffs?