[FarSe.]

pawn Code:

public OnPlayerSpawn(playerid)
{
    if(IsPlayerNPC(playerid))
    {
        new name[24];GetPlayerName(playerid,name,24);
        if(strcmp(name,"BOTNAME",true)!=0)
        {
            SetPlayerSkin(playerid, IDSKIN);
        }
    }
}

Too slow