YCS = Yvsa Cherokee Special, designed by him as one of the first, if not the first, forumite-initiated designs. He made the original model that was sent over.
The one on the far right is a typical example, by Sanu from the early-2002 time frame. Since I got the other more collectible ones later, this is now my main user (not that I get out much). So when people say "Wow, what the heck is that?", I can tell them about the others. This one actually had quite a few ripples in the blade, I ended up sending it to Dan Koster back when he used to do small custom fixes like that. Dan smoothed it out a bit, and added a satin finish, finished handle, and kydex sheath.
Then in late-2002 I think, Uncle Bill had a number of edge failures with the YCS, getting too thin and rushing production, so the kamis stopped making them for a while. The dark wood second from the right was from the first pair that arrived in 2004 I think, when they made a few as a test. That one is by Sher. You can see it is a chiruwa tang, and is quite thick overall, although still very well balanced.
Then with the YCS reestablished as a regular part of the HI line, maybe 2005, some bright person got the idea for a run of special YCSs. Paid in advance and then painfully waited

The checkerboard handle by Sher was in the first batch. You would not believe how well the handle inlays are done. That one is on the svelte side. Then the osage orange handled one on the far left was in the second batch, by Kumar. That one is back to chirua and beefy, but with a more pronounced curve like the early one on the right.
I always think it's cool that four of the "same model" can be so different.