I've seen the thief and thug tags on several posts where they don't obviously apply, which I believe means they warrant reexamination.
The wiki description for thief states,
This tag is for characters who are stealing something, or are well-known thieves such as Sly Cooper and Robin Hood.
My emphasis. The bolded part is tag-what-you-know, which is a violation of tag policy. I think it should probably be changed.
Thug has similar problems. The wiki description states,
Thug refers to one or more characters who possess an intimidating appearance and unseemly mannerisms, on top of treating others violently and roughly.
This is vague and subjective, and like thief it's often tagged based on characters being thugs in their source material, even if they aren't demonstrating thuggish behavior or appearance in the image itself.
Gangster might have similar issues, though it has no wiki description at present.
Should we redefine these tags to only apply in images where characters exhibit behavior associated with these roles, or retire them completely?