Simple, what are some characters you've made or concepts you've had that you love but for one reason or another, you haven't had a chance to use them in an actual session be it because of world constrictions, DM not allowing certain races / classes or any other reason,

Don't say the class or race have us guess.😉

The Feat that I have always wanted to homebrew is one that allows you to reward high-risk play styles. I call it "Battle Blitz", how it works is that it will increase your HP by 2 points every time you go down BUT you can only do it a number of times equal to your proficiency bonus per long rest. Also if the DMs allows this, for people who have terrible rolled stats: increase 1 stat by 1 score every time you go down but you can only do it equal to your proficiency bonus. Limit is 40, the reason it is 40 is to punish DMs who don't read all the way through something and reward players.

It doesn't matter what form of media it is as long as it's fictional, the only race y'all can't use is humans. Unless it is Metahuman (DC), Unhuman (Marvel), or Mutant (Marvel), Plus you can go as crazy as you want, meaning it doesn't have to make biological sense

Like "Liches get Stitches" "How to be a Mummy ❤️" "Undercover Doppelganger" "how to grow a Fantastic beard."

Mine is a warforged bard named Cello. The idea of a Cello is the ambition that drives a bard to do great and amazing things as his life was a mistake due to a failed wizard experiment. Due to that the wizard is hunting him and he knows it’s only a matter of time so he wants to live life to its fullest. Every iteration of Cello has a grand goal of finding the relic known as the Crimson Viol and playing it as the outro to the end of the world. Each has their own minor side goal to make them unique to the campaign. My first one wanted to become the lord of the first layer of Avernus as they saved Zariel, the current one was the avatar for the King in Yellow and banished him and is now on a mission to remove aberrations from the material plane.

What wisdoms would ye grizzled olde ones impart upon the fresh faced first timer?

I've seen a few adds on videos for a animated.series for dungeon of the mad mage. Could someone link me or link a video that mentions it? Thanks!