What's your favorite boss fight, and why do you enjoy it? I'll go first.
Me, personally, I enjoy Fuelweaver the most honestly, his mechanics are fun, although preparation is a big thing, unless I have already built the celestial portal and I could use volt goat jelly as Wolfgang. I usually use bqc (bee queen crown), thulecite suit, 1 weather pain, nightmare amulet and lazy explorer, also a few meatballs.
His mechanics aren't overwhelming and the boss fight is fun overall, the boss fight is very exciting and full of fun.
What's your favorite?