Makes me want to make several more badges for different things, though I don't know what they'd be for.
I'd like to see a badge for banned accounts (maybe the mushroom cloud can work there?). It would help when reporting posts.
I wouldn't be against that, but I think just turning their rank to
Banned or it being under their rank would be better.
Agreed, that would be better. However, I've suggested this before in other threads, and it didn't get implemented. That's why I tried the second best option: a "banned badge".
It's annoying when users sometimes report an already banned member for copy and pasting etc.
It's useless work for the user too, and would safe all parties time if it can be prevented. If that time can be used to report others, the banned tag can actually help cleaning the forum.
Maybe the Simple Ban Logo is enough for them since they didn't contribute to the forum?

= this is for the ones who do plagiarism / copy pasting.

= this one for one line spammer / ICO Bumpers
I wouldn't mind if this would be set as an Avatar for all banned accounts (if it's possible to add an Avatar to banned Newbies). Seeing accounts get banned could scare other users into following the rules (I hope).

- Spammer

- Copy Paste / Plagiarism

- Cheater
Does the forum keep track of the reason why users have been banned in the past?
I'm not sure about the color coding, I can imagine many banned users would fit several categories.
Perhaps one "privilege" for a large number of reports could be the ability to see banned user status?
I would like that, but I prefer to be able to see the banned status without being logged in (so I can scrape it).
Probably, to prevent abuse. If someone is temp banned for a week or so, and this is public knowledge it could come up later down the line.
Temp bans don't show up in modlog, and I wouldn't want to see temp bans in profiles. It's only useful to know which users won't ever come back.
I'm not sure what the benefit of knowing this information would be though. If you are reporting one of their posts then it doesn't really matter whether they are banned or not if their post is off topic/spam or what ever as it adds to the clutter of the thread.
Most spambots above Newbie only get banned, their spam stays on the forum forever. I care much more about getting a spambot banned than just having a post deleted.