All far too memorable for me. The only two I had to refresh my memory on were Jasper Johns and Jason Holt.
Holt especially I can not recall what he looks like, what position he played, any of his goals, nothing! Yet he scored 5 goals which should de facto make him the most memorable player on the list, making the fact I have no idea who he is even more mind boggling!
I'm gonna have a go at this... even though drawing up a list of things you've completely forgotten about should technically be a impossible! So googled most of these and only gone for those who actually pulled on a first team shirt, as opposed to those we signed but never once crossed the white line for us. In fact those with bigger reputations and those that have played more games for Dem Blades get themselves on this list over others, as to be forgotten having played more games is far less excusable (all stats unreliably taken from transfermarkt.com)...
Alan Fettis (somehow he has two clean sheets from three appearances, most likely giving him the best clean sheet to game ratio in our history!)
Marcel Sas (I've heard the name. That's all I remember!)
Anders Jacobsen (can't find his Blades stats but I'm almost positive he played numerous times for us)
Stephen Jordan (played a whopping 15 times and set up two goals)
Shane Nicholson (this guy I do remember playing but wondered if others here do too?)
Tommy Black (played four times and scored once during a loan spell)
Grant Smith (racked up a whopping 10 appearances for us and I have no idea what he looks like)
John Halls (defensive midfielder loaned from Reading roundabout the Bryan Robson era)
Ryan France (rings a bell)
Michael Boulding (the epitome of forgettable)
Dean Sturridge (I remember his Derby career, just not us ever having him or him making 4 appearances for us during the 03/04 season)