Here's a list of my funniest/best :

Characters:
-Wiggles
-Lubstospooge
-Missymoomoo
-Milkymoomoo

Guilds:
-Murloc Preservation soc.
-Is a singer (parody of the raiding guild "Is a sinner" )
-Kitty Cuteness
-The Fakeeyes (Parody of the raiding guild "The Snakeeyes" )

Guild Name: Hordecore PwnographyFor a Horde guild ofc.Srsly...how can you not just love that x]

lol.. that's a gd one :p

How about:
Guild Names:
Guild
Protectors of the brown Squirrels
MEGA SUPER AWESOME COOL GUILD
Space Ninja Alien Pirates
The Cow Squad "An exclusive only tauren guild" (only taurens allowed)
We R DeAd bUt AlIvE (undead guild)
Illidan Stole My Bike
What's a Guild?
Beer is Life (Dwarf guild)
We hate goblins (Gnome Guild) cuz gnomes build stuff and goblins blow it up)
I love Waffles
I love Pancakes
I love French Toast
The ***** League
My Guild is better than his
Archimond is Gay
Kael'Thas SunStripper
Teh CaNiBaLs (another undead guild)
Fresh Milk (Tauren Guild)
Green Eyed Peas (Blood elf guild)
No Guild Name
Those are all the names i can think of!
Funny Character names:
MagicMidget (Gnome Mage)
ItWasntMe
MagicMilk (shaman Tauren)
VooDooMilk(shaman Tauren)
ThisIsMyName
Name
Thelongestnameinwarcrafthistory
Wafflecakes(gnome)
Imverytall (gnome)
Iluvbeer(dwarf)
Iluvalcohol (dwarf)
Mygurlfriendisacow
Ihealyourass (priest)
Mydentistisproundofme (Troll with long teeth)
Vendingmachine(mage)
Tyranosaurusmoo(Tauren)
Undeadaremy*****es(Death Knight)
And so on cuz i have more ideas but I can't write them all...
I hope u liked my ideas...btw plzz leave a reply if u did.
NOTE:ALL Gramatical issues are all with good intentions and i'm aware of cuz i writed them so it would be funny so don't think that I don't know how to write and spell words!