The function MEMINT_HexCharToInt does not take capital characters into account and the function MEMINT_ByteToKeyHex fails for digits larger than 0x9.

The first can be fixed by a simple lower case conversion (it's time we finally complement the STR_Upper function with a STR_Lower function) and the latter by the following lines of code (taken from byte2hex in ScriptBin/convert.d).

 func string MEMINT_ByteToKeyHex(var int byte) {
     const int ASCII_0 = 48;
+    const int ASCII_A = 65;
     byte = byte & 255;
+ 
+    // Fix ASCII characters (A to F)
+    var int c1; c1 = (byte >> 4);
+    if (c1 >= 10) {
+        c1 += ASCII_A-ASCII_0-10;
+    };
+    var int c2; c2 = (byte & 15);
+    if (c2 >= 10) {
+        c2 += ASCII_A-ASCII_0-10;
+    };
 
     const int mem = 0;
     if (!mem) { mem = MEM_Alloc(3); };
 
-    MEM_WriteByte(mem    , (byte >>  4) + ASCII_0);
-    MEM_WriteByte(mem + 1, (byte &  15) + ASCII_0);
+    MEM_WriteByte(mem    , c1 + ASCII_0);
+    MEM_WriteByte(mem + 1, c2 + ASCII_0);
     return STR_FromChar(mem);
 };

On the rare occasion that a mod removes Ikarus in an update, players may be experience an error on loading a game save prior to this change, because the MEM_Helper NPC is inside the archive but its NPC instance is no longer present in the scripts.

This scenario might be very unlikely, but the fix would be very minor, so it cannot hurt:

Just set the flag zCVob_bitfield4_dontWriteIntoArchive in MEM_Helper after inserting it in Ikarus.d just after line 316.

By chance I stumbled upon this piece - variable is unused, so this can be possibly removed:
var zCVob vob; vob = _^(vobPtr);

zCRoute_vtbl = 8252184; //8252184 is actually 0x007DEB18 zCWaypoint_vtbl, correct value is 8252208 007DEB30
zCZoneMusic_vtbl = 8252476; //8252476 is actually 0x007DEC3C oCZoneMusic_vtbl, correct value is 8242628 007DC5C4
zCCSManager_vtbl = 8194068; //8194068 is actually 0x007D0814 oCCSManager_vtbl, correct value is 8195652 007D0E44
zCDecal_vtbl = 8241804;	//8241804 is actually 0x007DC28C zCZoneZFogDefault_vtbl, correct value is 8207876 007D3E04

Here is list of all vtbl constants, maybe can be useful:
G2A all vtbl values - Copy.xlsx
G1 all vtbl values - Copy.xlsx

In release MEM_CheckInheritance is missing, what makes AF Script Packet unable to run.

Some classes provided for Gothic 2 are not available for Gothic 1. Most of them can probably just be copied from the Gothic 2 to the Gothic 1 scripts.

If Ikarus is initialization from InitPerceptions (in order to use Ikarus before the main menu is reached), it raises null pointer warnings for MEM_InfoMan and MEM_SpawnManager in Gothic 1.

Like the "recent" change to wrap MEM_Camera and MEM_SkyController into null pointer checks (see 33157f2), this should be done here too.