0x0001 FIRE_RING_BRIGHT (SPFL)
0xE000 IC_CYCLOP (MCYC)
0xE040 IC_HISTACHII (MHIS)
0xE060 IC_LICH
0xE0A0 IC_ICE_TROLL (MTIC)
0XE0C0 IC_SNOW_TROLL (MTSN)
0XE0D0 IC_UMBERHULK (MUM2)
0xE200 IC_BEETLE_COPPER (MBET)
0xE210 IC_BEETLE_FIRE (MBFI)
0xE220 IC_BEETLE_BLACK (MBBM)
0xE230 IC_BEETLE_RHINOCEROS
0xE300 IC_GHOST (MGHO)
0xE310 IC_GHOUL (MGH2)
0xE320 IC_GHAST
0xE510 IC_LIZARDMAN2 (MLI2)
0xE520 IC_LIZARDCASTER3 (MLI3)
0xEA10 IC_SHADE (MSH1)
0xEA20 IC_SHADE2 (MSH2)
0xEC00 IC_WIGHT (MWIG)
0xEC10 IC_WIGHT2 (MWI2)
0xEC20 IC_WIGHT3 (MWI3)
0xEE00 IC_ZOMBIE
0xEE10 IC_ZOMBIE2

Hmm, is this a complete list?

GemRB has the following (for >0xe00):
0xE000 MCYC
0xE010 METN
0xE020 MTAN
0xE040 MHIS
0xE050 MLER
0xE060 MLIC
0xE070 MMIN
0xE080 MMUM
0xE090 MMER
0xE0A0 MTIC
0xE0B0 MTRO
0xE0C0 MTSN
0xE0D0 MUMB
0xE0E0 MCOR
0xE0F0 MGIC
0xE0F1 MGLA
0xE0F2 MWAV
0xE200 MBET
0xE210 MBFI
0xE220 MBBM
0xE230 MBRH
0xE300 MGHO
0xE310 MGH2
0xE320 MGH3
0xE400 MGO1
0xE410 MGO2
0xE420 MGO3
0xE430 MGO4
0xE500 MLIZ
0xE510 MLI2
0xE520 MLI3
0xE600 MMYC
0xE610 MMY2
0xE700 MNO1
0xE710 MNO2
0xE720 MNO3
0xE800 MOR1
0xE810 MOR2
0xE820 MOR3
0xE830 MOR4
0xE840 MOR5
0xE900 MSAL
0xE910 MSA2
0xEA00 MSHR
0xEA10 MSH1
0xEA20 MSH2
0xEB00 MSKT
0xEB10 MSKA
0xEB20 MSKB
0xEC00 MWIG
0xEC10 MWI2
0xEC20 MWI3
0xED00 MYU1
0xED10 MYU2
0xED20 MYU3
0xEE00 MZO2
0xEE10 MZO3
0xEF00 MWWE

Well, my list relates only to animations added in NeJ2. Also some animations in your list have been already included in the original ToB ANIMATE.IDS. It would be a good idea if you write down the animation names (not only their codes). Also I believe that you may reserve many additional slots in GemRB if you wish. Everything is up to you Avenger. Let me post my (used in NeJ2) ANIMATE.IDS just in case (for >0xe00).

0xE000 IC_CYCLOP
0xE010 IC_ETTIN
0xE020 DONOT_USE
0xE040 IC_HISTACHII
0xE050 IC_LICHBLACK
0xE060 IC_LICH
0xE070 IC_MINOTAUR
0xE080 IC_MUMMY
0xE090 IC_MERILITH
0xE0A0 IC_ICE_TROLL
0xE0B0 IC_TROLL1
0XE0C0 IC_SNOW_TROLL
0XE0D0 IC_UMBERHULK
0xE0E0 IC_CORNUGONSKI
0xE0F0 IC_ICE_GOLEM
0xE0F1 IC_GLAB
0xE0F2 IC_WAILING_VIRGIN
0xE200 IC_BEETLE_COPPER
0xE210 IC_BEETLE_FIRE
0xE220 IC_BEETLE_BLACK
0xE230 IC_BEETLE_RHINOCEROS
0xE300 IC_GHOST
0xE310 IC_GHOUL
0xE320 IC_GHAST
0xE400 IC_GOBLIN_AXE
0xE410 IC_GOBLIN_BOW
0xE420 IC_GOBLINELITE_AXE
0xE430 IC_GOBLINELITE_BOW
0xE500 IC_LIZARDCASTER1
0xE510 IC_LIZARDMAN2
0xE520 IC_LIZARDCASTER3
0xE600 IC_MYCONID
0xE610 IC_MYCONID2
0xE700 IC_OROG1
0xE710 IC_OROG2
0xE720 IC_OROG3
0xE800 IC_ORC_MELEE1
0xE810 IC_ORC_RANGE2
0xE820 IC_ORC_MELEE3
0xE830 IC_ORC_RANGE4
0xE840 IC_ORC_SHAMAN
0xE900 IC_SALAMANDER
0xE910 IC_SALAMANDER2
0xEA00 IC_SHROOM
0xEA10 IC_SHADE
0xEA20 IC_SHADE2
0xEB00 IC_SKELETON0
0xEB10 IC_SKELETONA
0xEB20 IC_SKELETONB
0xEC00 IC_WIGHT
0xEC10 IC_WIGHT2
0xEC20 IC_WIGHT3
0xED00 IC_YUANTI
0xED10 IC_YUANTI2
0xED20 IC_YUANTI3
0xEE00 IC_ZOMBIE
0xEE10 IC_ZOMBIE2

In Avenger's list, what creature is this entry for?

0xEF00 MWWE

The ID/ToB "water weird" animation (0xEF10 MWWE).

Should be Water Elemental, but it does exist in ToB and in TS. Do you remeber that blue hydra? It was static in ToB, and I made it movable in TS.

I'm assuming that it follows the BGii animation structure. I've always liked the water elemental from IWD for some reason.