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I want this feature for my site like showing, staff, team. which pluggin is this?
That does not require a plugin as it's a default MyBB feature.
You need to upload your userbar/image to .images then go to ACP>Users & Groups>Groups>GROUP NAME>Group Image
Enter the path to the image you uploaded. Example:
File name: Admin.pnh
Your path will be the following:
images/admin.png
Scroll down and click "Save User Group"