Suggestions for youtube video?

So I've got an idea to make a youtube series for creating a really fun/epic boss with step by step conversational formatted video tutorial. Idk how long I can keep this up, maybe i can have the bug testers or even xikage himself help out with the series, but ultimately what I want to ask is

What mob or boss would you like to learn how to do? Please be specific with the layout of ideas you have like "a lightning wizard that spins and shoots out rays of sparkles that strike players with...

Suggestions for youtube video?