As teams are non-elemental (at least, theoretically), I couldn't choose your teams based on elements shown.
Your jsfiddle opens with the letters getting further apart from each other, or widening, and then the black boxes widen. It was obvious that this meant that your favourite boss is the widest. But who is this? Of course, it's clear that you actually meant the boss with the widest propaganda. Propaganda is made wider by very long lines of text. The longest sentence was from JonathanCrazyJ:
"Over the last year, since he started as a mercenary leader of a group called the Abyss Brawlers, he had laid claim to countless territories, and created a sprawling collection of colonies, and founded the Frostkracken Empire."
So JonathanCrazyJ is your 1st preferred boss.
A prominent part of the main part of your jsfiddle is the banner of Silences. The Silents are a species of creatures from Doctor Who that erase themselves from your memory as soon as you look away from them. It was obvious that this clue would lead to something I'd find difficult to remember. The things that are most difficult to remember are the most obvious. The most obvious thing about your jsfiddle is that the links go yellow when you mouseover them. The Boss with the most yellow in their profile pic is Discord, so she is your 2nd preferred boss.
Most of your jsfiddle is written in jQuery. I have no clue why, but then again what do I know. The first time you were Queried by a J in this thread was when joey asked you if you existed. So your 3rd favourite boss is ji412jo.
Feel free to specify your actual favourite bosses in the OP.