Here's the list. And the key for this list:
Green means it's already TMC-style.
Blue means it's easily editable to be in TMC style.
Yellow suggests other possible ways of doing this foe.
Red requires customs from scratch.
* = not taken yet.
x = claimed; W.I.P.
X = completed and submitted.
Bolded enemies come in multiple varieties, each holding different weapons (bow, spear, sword&shield).
* Arm-Mimic
* Armos
X Ball & Chain Trooper - DONE BY 4Sword
* Beamos
X Beetle - DONE by Sonikku
* Blade Trap
X Blooper - DONE by A.J. Nitro
* Bomber Trooper / "Mad Bomber"
x Bombite / Bob-Omb
X Boo - DONE by A.J. Nitro
* Bubble
* Buzz Blob - Use Electric ChuChu, if possible?
X Cheep-Cheep - DONE by A.J. Nitro
x Crab - started by Nabeshin
X Crow - DONE by Sonikku
* Darknut
* Floor Tile
X Gel & Zol - Small & large - DONE by Sonikku
X Ghini - DONE by Sonikku
* Giant Ghini / "Ghimongous" - or use FSA-styled sprites.
* Small and Giant Goponga Flowers
* Gibdo
X Goomba - DONE by A.J. Nitro
* Hardhat Beetle
* Helmasaur / Iron Mask
X Keese - DONE by Sonikku
* Kirby
X Leever - DONE by Sonikku
X Like Like - DONE by Sonikku
* Mask-Mimic / Shy Guy
X Mini-Moldorm - DONE by Sonikku
x Moblin
* Monkey Bomber
x Mutt / Wild Dog
X Octorok / Winged Octorok - DONE BY 4Sword
* Pairodd - Warping bird in Key Cavern
X Peahat - DONE by Sonikku
* Pincer
X Piranha Fish - DONE by Sonikku
* Piranha Plant - Use M&L overworld sprites, if possible?
* Pokey - Use M&L overworld sprites, if possible?
* Pols Voice
* Puff Bomber / Ziro
* River Zora / Zola - Use FSA-styled sprites, if possible?
x Rope
x Sea Urchin - Claimed by RyuKage2007
* Spark
* Spiked Beetle
* Spiny Beetle
X Stalfos - DONE by Sonikku
* Stalfos Knight / Hooded Stalfos
* Star
X Takkuri - DONE by Sonikku
x Tektite
* Three-of-a-Kind
* Thwomp & Thwimp - Use M&L overworld sprites, if possible?
* Vacuum
* Wizzrobe
* Zombie / ReDead
Enjoy.