I have not seen a way to show the username as well as profile fields in the realname. So here is a patch that provides that functionality. When this patch is applied you can reference the username in the pattern like this:
%1 %2 (%name)
Which will output something like this:
Darren Phillips (darrenp)

CommentFileSizeAuthor
#1 1146290-username-pattern.patch677 bytesdarrenphillips
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darrenphillips’s picture

darrenphillips CreditAttribution: darrenphillips commented
Status: Active » Needs review
FileSize
1146290-username-pattern.patch677 bytes

Here is the patch.

Status: Needs review » Needs work

The last submitted patch, 1146290-username-pattern.patch, failed testing.

hass’s picture

hass CreditAttribution: hass commented
Issue summary: View changes
Status: Needs work » Closed (outdated)