Koss does not move

Koss does not fight or move he slides across the ground every other hero moves fine and in Kaineng the other fighters jump back and forth

Make sure you have at least the first (attack) or middle (guard) buttons selected. It could be it is set on Avoid combat (the last button) that means he will not fight but simply run around instead...avoiding combat.

melee AI has always been buggy

first start with what Scars pointed out, then try calling targets to see if this alleviates some of the issues

So does he just not work or is it just an animation issue?
Tahlkora and vekk use to do no animations for me but they used skills fine.
they would not walk, no no attack or casting animations, and when they died they would still be standing up.
I fixed this by moving me dat file to another location and forcing GW to build a new one by doing an image.

Sounds like that is what you are talking about when you say he is "sliding across the ground".
Hope that helps.

Agreed. Likely a .dat problem - try -repair or (worst-case) -image yourself a new one.

Last time I had something like this happen, or one of those funny missing poly white box glitches, the next time I launched GW, it would "repair" data archive, haha.

I'd re-image though, if problems get worse.

Think that might help yes he stands there and slides to the fight looks funny but annoying I'll try that thanx