This is a list of all monsters and bosses that you can control in the current version of the mod. It's based on the original list by A.J. (thanks!). I’ve made this official one because I can edit it every time I update the mod, ensuring that this version is always up to date.

Enemies are split into monsters and bosses, and bosses are split by floor. All are sorted alphabetically.
X's mean you ARE able to play as the enemy, O's mean you aren't.
?'s mean that it is uncertain if these ever CAN be controlled.

Monsters:

Angelic Baby - O
Attack Fly - X
Baby - O
Baby Long Legs - X*
Begotten - O
Big Spider - X
Black Bony - X
Black Fly - O
Black Globin - O
Black Globin's Body - O
Black Globin's Head - O
Black Maw - O
Blind Creep - X
Blister - O
Bloodshot Eye - O
Blubber - O
Blue Boil - O
Blue Conjoined Fatty - O
Blue Gaper - O
Boil – X**
Bone Knight - O
Bony - X
Boom Fly - X
Brain - X
Brimstone Grimace - ?
Buttlicker - X
Camillo Jr. - O
Charger - X
Chubber - O
Clot - X
Clotty - X
Cod Worm - O
Conjoined Fatty – X*
Conjoined Spitty - X
Corn Dip - X
Crazy Long Legs - X
Cyclopia - O
Dank Death's Head - X
Dank Globin - O
Dank Squirt - O
Dart Fly - X
Death's Head - X
Dinga - X
Dip - X
Dople - X
Double Vis - X
Drowned Boom Fly - X
Drowned Charger - X
Drowned Hive - O
Embryo - O
Eternal Fly - ?
Evil Twin - O
Eye - O
Fat Bat - X
Fat Fly (Super Pooter) - X
Fat Sack - O
Fatty – X*
Flaming Fatty – X*
Flaming Gaper - X
Flaming Hopper - O
Flesh Death's Head - O
Floating Knight - O
Fred - ?
Frowing Gaper - X
Full Fly - O
Gaper - X
Gaping Maw - ?
Gazing Globin - X
Globin - X
Greed Gaper - X
Grub - O
Gurgle - X
Gusher - X
Gut – X**
Guts - O
Half Sack - O
Hanger - O
Hive - O
Holy Leech - X
Homunculus - O
Hopper - X
Horf - X
Host - X
Hush Fly - O
I. Blob - X
Imp - O
Kamikaze Leech - X
Keeper - O
Knight - O
Leaper - O
Leech - X
Level 2 Fly - X
Level 2 Spider - O
Lil' Haunt - O
Lump - O
Maggot - X
Mama Guts - O
Mask + Heart - X
Maw - X
Meatball - O
Mega Clotty - O
Mega Troll Bomb - X
MemBrain - O
Ministro - O
Mom's Dead Hand - ?
Mom's Hand - ?
Moter - X
Mr. Maw - O
Mulliboom - X
Mulligan – X*
Mulligoon - X
Mushroom – X**
Nerve Ending - ?
Nerve Ending 2 - ?
Nest - O
Nightcrawler - ?
Null - O
One Tooth - O
Oob - O
Pacer - X
Pale Fatty – X*
Para-Bite - X
Poison Mind - X
Pooter - X
Portal - ?
Psy Tumor - O
Psychic Horf - X
Psychic Maw - X
Rage Creep - X
Ragling - O
Red Boom Fly - X
Red Ghost - ?
Red Host - X
Red Maw - X
Ring Fly - ?
Rotty - X
Round Worm - ?
Roundy - ?
Sack – X**
Scarred Double Vis - X
Scarred Guts - O
Scarred Para-Bite - O
Selfless Knight - O
Skinny - X
Small Baby Long Legs - X*
Small Crazy Long Legs - X
Spider - X
Spit - X
Spitty - X
Splasher - X
Squirt - O
Stone Eye - ?
Stone Grimace - ?
Stoney - O
Sucker - X
Swarm Fly - O
Swarmer - O
Swinger - O
The Thing - X**
Ticking Spider - O
Trite - X
Tumor - X
Turret Grimace - ?
Ulcer - ?
Vis - X
Vomit Grimace - ?
Walking Boil – X*
Walking Gut – X*
Walking Host – X*
Walking Red Host – X*
Walking Sack – X*
Wall Creep - X
Wizoob - ?

Bosses:

Chapter 1:

Blighted Ovum - O
Dangle - O
Dingle - X
Famine - X
Fistula - X
Gemini - O
Gurglings - X
Larry Jr. - X
Little Horn - O
Monstro - O
Pin - O
Rag Man - O
Steven - O
The Duke of Flies – X
The Haunt - X
Turdlings - O
Widow – X*

Chapter 2:

Big Horn - O
C.H.A.D. - O
Chub - O
Dark One - O
Gurdy - X
Gurdy Jr. - O
Mega Fatty - O
Mega Maw - O
Peep - O
Pestilence - O
Polycephalus - O
Rag Mega - O
The Carrion Queen - O
The Forsaken - O
The Frail - O
The Hollow - O
The Husk - O
The Stain - O
The Wretched - O

Chapter 3:

Brownie - O
Gish - O
Loki - O
Mask of Infamy - O
Mom - ?
Monstro II - O
Sisters Vis - O
The Adversary - O
The Cage - O
The Gate - O
War - O

Chapter 4:

Blastocyst - X
Conquest - O
Daddy Long Legs - ?
Death - O
It Lives - ?
Lokii - O
Mama Gurdy - O
Mom's Heart - ?
Mr. Fred - O
Scolex - O
Teratoma - X
The Bloat - O
Triachnid - ?

Chapter 4.5:

Hush - ?

Chapter 5:

Isaac - ?
Satan - O

Chapter 5.5:

Delirium - O

Chapter 6:

??? - ?
Mega Satan - ?
The Lamb - O

Greed Mode:

Ultra Greed - O
Ultra Greedier - O

Misc:

Gabriel - O
Krampus - O
The Fallen - O
The Headless Horseman - O
Uriel - O

Mini-Bosses:

Envy - O
Gluttony - X
Greed - O
Lust - O
Pride - X
Sloth - O
Wrath - X
Super Envy - O
Super Gluttony - X
Super Greed - O
Super Lust - O
Super Pride - O
Super Sloth - O
Super Wrath - X
Ultra Pride – O


*Player currently has control over movement, but attacks and abilities are automatic.
**Changes into a similar enemy so it can be controlled.


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I'm also now working on making champions properly control-able.
All normal enemy champions can be controlled, but boss champions are weird, so not all of them work yet.
Here's a list of the champion versions of bosses that can be controlled.
X means you can play as that champion.
O means that champion will just be replaced with the normal boss so you can control it.



Chapter 1:

Green Larry Jr. - X
Blue Larry Jr. - X
Red Dingle - O
Black Dingle - X
Black Gurglings - O
Yellow Gurglings - O
Pink Widow - X
Black Widow - X
Pink Haunt - O
Gray Haunt - X
Green Duke of Flies - O
Orange Duke of Flies - O

Chapter 2:

Black Gurdy - O