Here is one change that could help with the information problem with Monster Champions:
Champion buffs are no longer assigned randomly per-Champion. Instead, for each dungeon there are 3 sets of Champion buffs: Yellow, Grey, and Brown. Those sets are permanent, and assigned randomly for each dungeon (or overridden by a designer). When a Monster Champion spawns in that dungeon, it will use one of those 3 buff combinations, and change the color of the crown icon to show which set it's using.
That way instead of each individual Champion having the possibility of the whole range of buffs, the players can learn and know what they do and mean.