Boss Teamwork mechanics for multiplayer bosses

I think that boss mechanics should most definitely do something like this. In my time playing Terraria, this is something that I sorely missed. The bosses felt so lame. There was no real challenge to them in a team, even alone they were pretty basic.
Having mechanics that would make team bosses interesting would be awesome, have things that involve player interactions, have different roles for players (not necessarily the healer tank DPS triad so common in MMOs, perhaps having equally good hybrid play styles would be good enough, or something along the lines of what League of Legends does.)

 

Nevertheless this variation should also exist, as an option, of course. I bilieve there should be a diversity of ways to kill a boss. Starting from pure maximum damage, going through tank-DPS-heal concept and finishing somewhere near clever use of boss mechanics.