Yes Glasfryn was always prolific on the match day threads. Cornish Gull (or was it Seagull) was another one who had long running health issues and I haven't see him post for an age, hope that they both just gave up on NSC rather than anything more sinister.
Edit, just seen that Hillian raised...
There are quite a few who, sadly, don't seem to post much, if at all, anymore.
Shame now we've reached the promised land. Some were quality
I'll start with:
Dick Knight's Mumm