Oh god, this just sums up about ALL of my characters.
The first joke we'll start with is my character Jim (whos not here yet rip) being named Slim Jim. He was ORIGINALLY a deer, then he became a cow, then he became an alien fungus resembling a cow, now he's just an alien fungus. Back when he was still a deer, I joked that his name was Slim Jim, so then he became a very skinny cow. I then joke he was a stoner, so he became a pyscadelic cow fungus alien who has a tail made of weed. This became part of his character, and he even sometimes smokes himself because its cheaper than buying drugs.
Next is Dogfather, who also doesn't have a profile here, but his name started off as a joke about how he was a cereberus who adopted a kid. It was supposed to be a placeholder... but it just stuck.
Next is Myev Lemeliv! Look at her last name. Looks a bit normal for a fantasy setting, right? Think again! It's a twist on the phrase "Let me live", because my friends were insisting that I couldnt play as a Half-orc bard. I just kept saying "Let me live!", so i made it her last name. Her entire character is silly but canon, it all started as a joke. For example, in the entertainer kit, you can get a trinket from an admirer. One possible trinket was a mummified goblin hand. So, I chose it! She now has a secret admirer who sends her mummified goblin hands. Some other fun canon jokes are: Slut shaming dragons, being the enemy of a god after licking a carving, and apoligizing to trees.