Haha, alright, I can break it down for you:
1. Simple, creating MUGEN characters and stages all while making music sounds like a blast to me! I've made tons of stages, and even made custom tracks to go with them!
2. When I said "intermediate-level author, I mean the fact that I've got SOME knowledge and experience under my belt editing characters, stages and screenpacks alike. I've got some pretty good talent, but I'm not THAT good to be considered an expert. I'm a part of the King of Fighters MUGEN side of the community, and I've created 2 edits named Void and Kiroshi (Kiroshi had to be cancelled due to controversy). I've made a few stages as well. While I've made a screenpack before, I'm relatively new to creating an Ikemen GO one.
3. Fair point, so to be more specific, I compose soundtracks for both games AND animations (I'm starting my own animation series soon). It's really just a hobby, as I don't make any money from my soundtracks (I hope to do soon in the future!).
4. Yes, I am aware of what this place is all about. And while I'm not as experienced enough as most people here, I'll personally do my best and share a lot of my content here!
Hope these answered your questions!