i know very few l4d characters, but the ones i do know are Bill francias and louis. in every garry's mod with louis, he has this overunnecessary obsession with the pills or "peels" as they're refferred as by some ponies. he gets crazy when he sees them, and i mean pinkie-crazy. nice establishment of that
1st game: Name - Left 4 Dead: Ponyville Characters - Apple Jack, Rainbow Dash, Pinkie Pie, Princess Luna Motto - My LittleUndead Pony
2nd game: Name - Left 4 Dead: Canterlot Characters - Rarity, Twilight Sparkle, Spike, Princess Celestia Motto - Friendship is MagicSurvival
3rd game: Name - Left 4 Dead: Equestria Characters - (any 4 characters from the first 2 games) Motto - ...magic makes it all complete...
Note: Fluttershy can not be played by default, she can how ever be rescued in any campaign and unlocked for play. She will spawn randomly in any campaign on any level (most likely hiding in a closet), crying for help. Once rescued she will act like any other AI (but will not attack) and must be escorted to the end of the campaign. Once unlocked, she will replace any other survivor of your choice in the character selection menu.