Don't judge, chances are you've all had a cartoon or anime crush at one point or another. Some people just don't outgrow the habit. I am one such person.
I've got or had a crush from pretty much every piece of media I've ever come into contact with. God, I need a life. emotion_facepalm
I'm just going to list mine here, but a few will probably be missing because there's no WAY I'll remember them all at once!
(Why are there so many psychopaths in here oh my god.)

Zorbak - Artix Entertainment.
Beastboy - Teen Titans.
Dib and Zim - Invader Zim.
Stinkie - Casper.
Jojo Mcdodd - Horton Hears a Who.
Death the Kid - Soul Eater.
Grey Fullbuster - Fairy Tail.
Sebastian and Ciel - Black Butler.
Shifu - Kung Fu Panda.
Link - Monsters Vs. Aliens.
Onceler - The Lorax.
Mr. Blik - Catscratch.
Chester and AJ - Fairly Oddparents.
Diego and Buck - Ice Age.
Kyle the Conjurer - Fanboy and Chum Chum.
Sheldon - My Life as a Teenage Robot.
Ratchet - Ratchet and Clank.
Daxter - Jak and Daxter.
Crypto - Destroy All Humans.
Wilbur - Meet the Robinsons.
Thatch and Wolfie - Casper's Scare School.
Dipper Pines - Gravity Falls.
Numbuh 4 - Kids Next Door
Ickis - Ahhh Real Monsters
Draco Malfoy - Harry Potter
Nergal Junior - The Grim Adventures of Billy and Mandy
Larry/Cheatsy Koopa - Mario
Randall Bogs - Monsters Inc.
Fishlegs and Dagur the Deranged- How to Train Your Dragon
Vector - Despicable Me
Karkat, Eridan and Caliborn - Homestuck