My Little Pony: Fallout is Magic adds ponies to Fallout 3. Several different pony followers can be found near Canterbury Commons. Simply talk to them in 1st person and tell them to follow you. They are all marked as essential since Friendship is Magic. The pony creatures are rigged onto the brahmin skeleton. I have attempted to change their idle/attack sounds from the default brahmin sounds to no avail.

Currently the mod adds:
Princess Celestia
Twilight Sparkle
Applejack
Fluttershy
Pinkie Pie
Rainbow Dash
Rarity

Princess Luna
Derpy
The Great and Powerful Trixie

Littlepip
Velvet Remedy
Blackjack

All ponies are near Canterbury Commons, except Trixie who is slightly north of Canterbury Commons.

Installation:
unzip folder
move contents of folder to the Fallout 3 directory, if you are using steam it should look something like this:
C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty\Data

Uninstallation:
Take any junk you have given to any followers added to this mod.
Remove the following files:
C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty\Data\mlpmod.esp
C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty\Data\textures\creatures\ponies
C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty\Data\sound\fx\Ponies
C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty\Data\meshes\creatures\brahmin

Unless you have another mod which in some way edits the brahmin folder.


Brahmin Sound Replacer
The Brahmin Sound Replacer.esp can be used if you want to the make the ponies sound less like brahmin. Currently it replaces the attack, hurt, death, and moo sound. Note that it replaces the sounds ALL brahmin make, not just the ponies. It uses sound files in the main mod so that is a requirement.

Dr. Boring or How I Learned to stop worrying and just use the Brahmin Skeleton:
Some time ago, back in 2014 I had started messing with the GECK. I never really made anything but I got to know it a bit and the .nif format while I was modding another unrelated game that also just so happened to use the gamebyro. When I grew bored with that game and I gave modding fallout 3 a shot. The first mod I tried, ponies. Obviously it exploded in my face. Repeatedly. I mean it just kept happening. Eventually I got the meshes themselves to work in fallout 3. Then I rigged them onto a dog. It didn't really look good. So I adjusted the skeleton, and edited the kfs. I had myself a nice working pony creature, which caused the game to crash whenever I changed cells. At that point I gave up on modding fallout 3. A few months later after growing bored of modding a different game I decided to give modding fallout 3 another shot. This time I decided to rig the pony mesh onto the brahmin skeleton. I once again adjusted the skeleton and edited the kfs, and got the same crashes on changing cells. I eventually figured out that it had something to do with a missing kf since the pony creature wasn't doing a few of the brahmin's idle animations. So I figured I'd just rig the thing onto a brahmin skeleton the best I could and call it a day.


Known issues:
*It is not possible to talk to any of the ponies during combat.
*Attempting to talk to a pony in third person will cause the game to force you into first person after the conversation has finished, making everything look wonky. I have tested basic dialogue with normal brahmin as well which presented the same error. To fix the camera either enter dialogue with a non-pony/brahmin or simply use your pipboy.
*eating the ground

Credits:
Bulk of the sounds came from the Skyrim My Little Pony mod by Sekai9999:
http://www.nexusmods.com/skyrim/mods/26677/?

Which in turn used sounds from: various MLP:FIM, Witchcraft is Magic, Team Fortress 2, Sega, Hotdiggitydemon's .MOV series and some of the sounds from Zdzichorowerzysta's voice pack.

A few of the other sounds were from here:
https://www.youtube.com/watch?v=YjUY4nbKlKk
https://www.youtube.com/channel/UCdNtOQTRViBAzY0byjlTb8Q

Whiteskypony made the littlepip mesh converted from gmod:
http://whiteskypony.deviantart.com/art/Littlepip-Reloaded-Fallout-Equestria-DL-435751852

Poninnahka made the Velvet Remedy mesh converted from gmod:
http://poninnahka.deviantart.com/art/Velvet-Remedy-Release-422343651

LoganD312 made the Blackjack mesh converted from gmod:
http://logand312.deviantart.com/art/DL-Young-Blackjack-pack-466070970

KPshadowsquirrel made the original meshes, converted to .nif by me:
http://kp-shadowsquirrel.deviantart.com/art/Pony-Model-Download-Center-215266264