Individual profile in the topic

You need to find and remove the following in the postContainer template:

{{if $comment->author()->member_id}}

Next, add the following code (to any place convenient for you, you can go where the previous one was, but it's best to put it under the avatar):
For users:

{{if $comment->author()->member_id == X}} <!-- In place of X we write the user ID -->
	<!-- Here we write any code for display -->
{{else}}

For groups:

{{if $comment->author()->member_group_id == X}} <!-- In place of X we write the group ID -->
	<!-- Here we write any code for display -->
{{else}}