Ahri is a clingy needy girl who needs people to love her.
Akali can't sit still
Alistair has a hormone disorder that makes him aggressive and huge
Amumu is... Do I even need to tell you?
Anivia is experiencing immortality stress having been revived all the time.
Annie is a yandere loli
Ashe is secretly very proud of her ass
Blitz is a robot
Brand is a pyromaniac
Cait is a perfectionist, and will not settle for anything less than a head shot.
Cass has a severe case of being half snake
Cho'Gath ate your children
Corki still thinks it's WWII
Darius has an execution fetish
Diana has an inferiority complex that is somewhat Leona's fault.
Mundo has brain damage
Draven has an ego bigger than ten blimps riding a space whale... Or ten space whales riding a blimp.
Evelyn has a faint presence, and is therefore difficult to notice.
Ezreal's adventurous life has made his social interactions slightly awkward.
Fiddlesticks needs a brain
Fiora secretly wants a sado-masochistic relationship with someone who can match her in combat
Fizz is a fish
Galio is a freak accident between two birds and a stone
Gangplank spends all his money on oranges
Garen has extremely good balance, but his mother was also a spinning top
Gragas broke up with his wife and started heavy drinking
Graves was driven mad by betrayal and forever thinks it's the wild west.
Hecarim is a headless knight with a head, and is still looking for that head.
Heimer almost created nuclear power, but then he went insane
Irelia actually wanted to be a world-famous airboarder but war sucks.
Janna used to be a ****.
Jarvan feels the need to assert his superiority, thereby having an inferiority complex
Jax is secretly searching for his father
Jayce thinks he's a superhero
Karma wants to be known
Karthus is a vengeful spirit who wants to sing everyone lullabies and send them to sleep
Kassadin looks like he is now because his mother was an AD carry, not an AP caster.
Kat loves spinning and is tsundere
Kayle has always been sensitive about her appearance since she was young and therefore wears a helmet
Kennen consumes crack three times a day
Kha'Zix and Kog'Maw as notorious for their eating sprees down town
LeBlanc is arrogantly oblivious, since she thinks she has everyone fooled (Clearly we're not)
Lee Sin can't drive
Leona actually used to play Boktai when she was little
Lulu is a drug pusher who sells a lethal drug known as "Purple"
Lux's mother was actually a demon spawn who laughed people to death
Malphite is what happens when a man with a pet rock gets really, really lonely
Malz used to be a fresh prince until he took a void to the everything. Now he has a cool pet.
Maokai is when tree huggers go too far...
Yi is actually using his obsession with the Wuju style to cover for his affair with Baron Nashor, and his resultant child... (Guess who)
MF is also a ****
Morde was raised by rock gods
Morgana is what happens when you get the bad ending on your love interest's sister during the trip to the underworld.
Nasus is a dog.
Nautilus was once named Big Daddy.
Nidalee is a stripper
Nocturne is the boogeyman under a different name
Nunu was raised by yetis
Olaf was originally from a land known as Skyrim.
Orianna is a robot too and is constantly hit on by Blitz
Pantheon failed cooking classes since his Grand Skyfall would always ruin the kitchen
Poppy is obsessed with hammers and all things related
Rammus is socially inept
Renekton is what happens when you dump radioactive waste in the Nile River
Rengar is obsessive compulsive
Riven has an atonement complex
Rumble was raised in the bronx
Ryze used to be a power plant
Sejuani secretly has a boar fetish (or not secretly)
Shaco wanted to know what self-cest was like
Shen can see you fap.
Shyvana hates the Blades. A lot.
Singed used to be a bartender until he claimed the lives of hundreds in a single night.
Sion thought he was sent backwards in time to save someone.
Sivir's favorite choice of clothing is actually leather, and her favorite weapon is a whip.
Skarner is a Generation 7 Pokemon.
Sona can mind **** you (for those into that kind of thing)
Soraka was known for being a bit horny
Swain wishes there was a harpy champion in the league already
Syndra has a hoarding disorder where she wants hoard ALL the power
Talon likes sharp things
Taric is unsure of his gender
Teemo is actually a terrorist, guerrilla warfare specialist, and a drug lord, with Lulu as one of his top dogs.
Tristana is what happens when you give a small girl a very big gun.
Trundle should go back under that bridge of his
Tryndamere doesn't wear a shirt because he wants to exert that he's always a man, not for just five seconds.
Twisted Fate secretly plays children's card games
Twitch is what happens when the rat poison doesn't work.
Udyr is still on the run from PETA
Urgot wanted to be spiderman, but kind of got the wrong idea.
Varus is Ezreal's TRUE RIVAL! Who's ALWAYS ANGSTING OVER HIS DEAD FAMILY.
Vayne is what happened when Van Hellsing and Bayonetta met at that bar one night
Veigar was actually abused a lot at school when he was a kid
Viktor has a robot fetish
Vlad can only communicate in blood puns and wishes he were Dracula
Volibear is still waiting for an opportune time to replace Tibbers
Warwick is still waiting for Annie to visit her grandmother
Wukong is what happens when Tarzan was raised in China
Xin Zhao belongs in Dynasty Warriors
Yorick is a necrophiliac
Ziggs is Micheal Bay in disguise
Zilean has chronic memory loss disorder
Zyra is Poison Ivy's long lost sister.

I'm bored okay?

That's pretty funny!