Yes, some of these aren't exactly off-meta, but it's not like you see them as a support more than once every thousand games, right?
I have tried all of these as supports, some of them I even play often.
Why is this not played more as a support?
Champions that to me seem like really good supports
champions that seem to fit into the support role just fine
Could work, but has some minor drawbacks
Champions that work well as supports, but may not be that good in specific situations or lack something crucial for supporting.
Could work, but has some SIGNIFICANT drawbacks
Champions that could work as supports, but have drawbacks or lack something that greatly hampers their ability to work as a support, but may be great against specific types of champions
Does not work
Okay, maybe you can make it work, but it's probably going to be hard
Does not work at all
Champions that simply cannot be used as supports. Trust me, I have tried.